Chimie
Réactions chimiques, stœchiométrie, structures moléculaires et propriétés.
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3. analyze: an isotope is an alternative form of an element. each isoto…
A. Carbon - 12, Carbon - 13 B. Nitrogen - 14, Nitrogen - 15 C. Oxygen - 13, Oxygen - 15
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listed in the item bank are key terms and expressions, each of which is…
Metals: Ductile and malleable, Sodium, Magnesium, Iron Metalloids: Semiconductor, Silicon, Germanium, Arsenic Nonmetals: Oxygen, Nitrogen, Neon, Poor conductors
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when two elements bond and form a compound, what happens to their neutr…
The neutrons remain the same in the nucleus of each atom.
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select all steps below that help you handle chemicals safely. using dro…
using droppers to transfer small amounts of chemicals checking the test tubes for chips prior to using them washing your hands after you finish the lab
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question 1-1 what property of water allows it to be a versatile solvent…
polarity
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i must go down to the seas again, for the call of the running tide is a…
"tide" and "denied"
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and all i ask is a windy day with the white clouds flying, and the flun…
How many stanzas are in the poem? - 2 What is the rhyme scheme of the first stanza? - abcb What poetic structure does Masefield use? - Fixed - form poem
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ancient atomic models described the atom as a solid sphere with no char…
D. Subatomic particles could not be detected with the technology available.
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walt whitman was an american poet who was born in 1819. leaves of grass…
It has a free form. It does not have a specific rhyme scheme. It does not have a set meter.
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why do elements emit different colors of light when placed in a flame? …
A. Elements emit light because electrons get excited & then fall back to the ground state from an excited state
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all ______ is made of tiny particles called ______. atoms are made of e…
All matter is made of tiny particles called atoms. Atoms are made of even smaller particles called neutrons, protons, & electrons.
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2. combine the oxidation and reduction half - reactions for hydrogen pe…
$2MnO_4^-+5H_2O_2 + 6H^+ ightarrow 2Mn^{2 + }+5O_2 + 8H_2O$
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what are the reactants of this chemical reaction?
# Explicación: ## Paso 1: Identificar los compuestos de entrada Los reactivos son los compuestos que entran en una reacción química. Aquí, vemos que el agua ($H_2O$) y el dióxido …
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grams to atoms 5.11 g b 8.02 g s 1.5 g k 0.2550 g pt 1.37×10⁻¹⁰ g au
Boron: Approximately $2.84\times 10^{23}$ atoms Sulfur: $1.51\times 10^{23}$ atoms Potassium: Approximately $2.31\times 10^{22}$ atoms Platinum: Approximately $7.89\times 10^{20}$…
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question 19 (mandatory) (1 point) chest pain associated with coronary a…
Question 19: A. angina pectoris Question 20: B. pericardium
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name: elements, compounds, mixtures color by numbers directions: answer…
1. C. atom (purple) 2. B. molecule (yellow) 3. B. compound (blue) 4. A. molecule (pink) 5. B. mixture (pink) 6. A. compound (yellow) 7. C. mixture (pink) 8. C. at least one capita…
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the approximate molar concentration of several chemicals are given. fin…
Oven cleaner: 13 Water: 6.2 Blood: 7.4 Vinegar: 2.2
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green fertilizers promise a natural solution for promoting crop growth.…
- Green fertilizers improve soil quality using natural ingredients. - Companion planting does not necessarily require the use of chemical fertilizers. - Some fertilizers contain h…
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read the poem. skimming the bottom in the company of toes, i observe th…
C. abcb
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based on the reading, what are the properties of carbon - 14? check all…
Carbon-14 is a naturally occurring carbon isotope. Carbon-14 has a known half-life. Carbon-14 is present in all living organisms.
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exploring willard f. libby’s life willard f. libby received his undergr…
He received his undergraduate degree from University of California, Berkeley. After graduate work, he became a professor at University of Chicago. In 1960, he won a Nobel Prize in…
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23. where are the most stable elements found on the periodic table?
Group 18 (noble gases) of the periodic table.
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17. what is the ratio of protons to neutrons that is in the stable rang…
17. Approximately \(1:1\) to \(1.5:1\) 18. Elements with atomic number \(Z > 83\)
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10 multiple choice 1 point which of the following is not a key componen…
A. Fractionating column
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multiple choice 1 point what would you expect to happen if you used sim…
Both liquids would vaporize at the same time, resulting in poor separation.
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8 multiple choice 1 point why is it important to control the rate of he…
Heating too fast can cause both components to vaporize together, reducing the efficiency of separation.
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7 multiple choice 1 point in a simple distillation, what component dist…
The component with the lowest boiling point.
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6 multiple choice 1 point what is the role of the condenser in simple d…
To cool the vapor back into liquid
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multiple choice 1 point what is the main purpose of simple distillation…
To separate components of a liquid mixture based on differences in boiling points.
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multiple choice 1 point what happens if you heat the distillation flask…
B. Both components may vaporize together, leading to poor separation
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multiple choice 1 point which of the following conditions would be most…
Sealing the apparatus completely.
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2 multiple choice 1 point which of the following mixtures would be best…
D. A mixture of hexane and octane (boiling points: 69°C and 126°C).
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pre - lab quiz 5 answer all questions 1 multiple choice 1 point what is…
To collect the vaporized and condensed distillate
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5. ionic compounds containing transition metals are slightly different …
$CuCl_2$: copper(II) chloride; $CoS$: cobalt(II) sulfide; chromium(III) oxide: $Cr_2O_3$; titanium(IV) nitrite: $Ti(NO_2)_4$; $SiF_6$: silicon hexafluoride; $NO$: nitrogen monoxid…
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3. ionic compounds containing polyatomic ions are named similarly to bi…
$NaClO_3$: sodium chlorate $NaHCO_3$: sodium hydrogen carbonate (sodium bicarbonate) $K_2CrO_4$: potassium chromate $NH_4Cl$: ammonium chloride $MgSO_4$: magnesium sulfate $KNO_3$…
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directions: utilize the rules for chemical nomenclature contained in ch…
1. KF: potassium fluoride CaS: calcium sulfide LiBr: lithium bromide MgF₂: magnesium fluoride Be₃N₂: beryllium nitride Na₂O: sodium oxide KCl: potassium chloride CaO: calcium oxid…
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question 24 of 40 read the following description of a literary work: a …
B. Naming the owner of the chemical company after a fairy tale villain
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two of the covalent bonds are labeled with blank spaces. drag and drop …
Place one electron from $H$ and one electron from $O$ in each of the blank - space covalent bonds.
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now, drag and drop the correct partial charge symbol to label each atom.
For the oxygen atoms: $\delta^-$ For the hydrogen atoms: $\delta^+$
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which of the following best matches the description? condition in which…
A. thermal inversion
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which of the following is a secondary air pollutant? select one: a. ozo…
A. ozone
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the remains of plants, animals, and microorganisms are commonly referre…
b. compost
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which of the following best matches the description? biome that lacks t…
B. tundra
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which of the following best matches the description? uncharged particle…
g. neutron
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which of the following best matches the description? compound with a lo…
f. acid
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1. how would you complete this sentence? say it aloud to a partner. i w…
1. Varies (e.g., diverse) 2. b. many errors, c. no main idea 3. a. Catchy melody, b. Meaningful lyrics, c. Good rhythm 4. Varies Day 4: 1. Varies (e.g., soft and moldable) 2. a. f…
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3 the effects of mixtures of chemicals causing hazardous materials is c…
C. synergism
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which of the following air pollutants has been the most difficult to re…
d. ozone
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photochemical smog forms when ______ and ______ are trapped by a therma…
D. volatile organic compounds; oxides of nitrogen
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which of the following best matches the description? accumulation of po…
i. acid deposition
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which condition must exist in order for conduction to occur between two…
The molecules of the substances must be touching.
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conduction occurs when thermal energy is transferred by the movement of…
molecules
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which two conditions must exist in order for radiation to occur? the pr…
A temperature difference and the presence of electromagnetic waves
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which best describes a wave? a collision of particles a disturbance tha…
B. a disturbance that carries energy
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which of these uses logos? a. we are starving because the food, if you …
C. Yum Organics has been providing well - rounded organic lunches to schools on the West Coast for more than 15 years.
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what is biochemical oxygen demand? select one: o a. amount of oxygenreq…
A. amount of oxygen required to decay a certain amount of organic matter
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the amount of oxygen required to decay a certain amount of organic matt…
D. the biochemical oxygen demand.
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which one of the following is not associated with hydraulic fracturing …
A. an increased price for natural gas
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study the graph about the negative effects of indoor air pollution. ind…
Most people will die from the negative health effects associated with stroke as indoor dirty air builds up.
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how does the ozone layer help maintain ground - level air quality?
The ozone layer in the stratosphere absorbs harmful UV radiation, reducing chemical reactions in the lower atmosphere that could produce ground - level pollutants, thus maintainin…
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use the instructions below to complete the assignment: you are a molecu…
Here is a short poem from the perspective of a water - molecule: **"The Water - Molecule's Journey"** I'm a water - molecule, small but grand, In the ocean I start, in a liquid la…
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9. your energy journey: think about a simple action you do every day, l…
The chain of energy transformations for walking to school: Chemical energy in food → Chemical energy in ATP → Mechanical energy. For turning on a video - game console: Chemical en…
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explain how ozone in the stratosphere is formed.
Ozone in the stratosphere is formed when UV radiation splits oxygen - molecules into oxygen atoms, which then combine with oxygen - molecules to create ozone.
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88. which electron - configuration notation describes an atom in an exc…
c. [Kr]5s²4d¹
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5. practice: turn off show electron dot diagram. use the gizmo to creat…
Lithium: Sodium Beryllium: Magnesium
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5) during a temperature experiment, the room gets too warm because a wi…
5) Systematic error 6) Human error 7) Measurement error 8) Sampling error 9) Experimental error 10) Experimental design error
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the following is a chemical reaction for ______ with ozone. clo + bro →…
B. halons
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a chemist is using 3.32 milliliters of a solution of acid and water. if…
0.5
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select the correct answer. which of the following is a medicine that st…
# Breve explicación: Los antitoxinas son sustancias que estimulan la respuesta inmune del cuerpo para producir anticuerpos que neutralicen toxinas producidas por patógenos. Los an…
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7 analyze as the bright sun shines upon the water, the water slowly dis…
The disappearance of water is a physical change. The conversion of water and carbon dioxide into sugar and oxygen by plants is a chemical change. ### 8
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critical thinking use this photo to answer the following question. 7 an…
The disappearance of water is a physical change. The conversion of water and carbon - dioxide into sugar and oxygen by plants is a chemical change. ### Question 8
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chemistry chapter 1 - 4 crossword review across 2 a 27.092 g object has…
2. 28.8 6. mL 7. cm 8. product 9. density 12. compound 13. chemical 15. kg 17. one 20. homogeneous mixture 21. reactant 23. 5 24. qualitative 25. heterogeneous mixture 27. kilogra…
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is this a complete sentence? due to the structure of hydrogen bonds, ic…
yes
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7. why are fish eggs particularly sensitive to ph changes? 8. how does …
7. Their membranes are vulnerable and chemical reactions for development can be affected. 8. Low pH dissolves metals making them bio - available; metals are toxic to aquatic organ…
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(5.4.c) types of movies (wk 5) what is a movie theme? ○ a pitch, or sho…
a unifying idea that a film expresses through its narrative or imagery
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key concepts 4 identify give an example of a physical change and an exa…
4. Physical change: Melting ice. Chemical change: Burning wood. 5. Chemical change forms new substances; physical change only alters physical properties. 6. The 4 kg is likely con…
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3 law of conservation of mass
The law of conservation of mass is a fundamental principle in chemistry stating that in a closed system, the mass of substances before a chemical reaction is equal to the mass of …
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the transformation and transport of substances though parts of earths s…
Carbon, nitrogen, phosphorus, sulfur, water - containing compounds etc.
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which chemical formula reflects the diagram? 6o12h6c 6c12h6o o6h12c6 c6…
D. $C_{6}H_{12}O_{6}$
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general chemistry 4th edition university science b presented by macmill…
\(NH_{3}\), \(NH_{4}NO_{3}\), \((NH_{4})_{2}HPO_{4}\), \((NH_{4})_{2}SO_{4}\), \(KNO_{3}\), \((NH_{4})H_{2}PO_{4}\)
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17) c₄h₈fcooh # of molecules: # of elements: name of element: # of atom…
17) # of molecules: 1 # of elements: 4 Name of element: Carbon, Hydrogen, Fluorine, Oxygen # of atoms: 5, 9, 1, 2 Total # of atoms: 17 The #4 is a subscript 18) # of molecules: 2 …
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which strategies did the united states employ in order to achieve victo…
B. island - hopping, D. bombing
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read the passage from sugar changed the world. no one could have seen i…
Advances in the production of sweeteners hastened the end of involuntary servitude.
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visual reading tool: chemical bonds 1. what kind of chemical bond holds…
1. Covalent bond 2. Electrons 3. Ionic bond 4. Covalent bonds involve electron - sharing, ionic bonds involve electron - transfer and attraction of ions.
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11) pb(no₃)₂ # of molecules: # of elements: name of element # of atoms:…
11) - # of molecules: 1 - # of elements: 3 - Name of element: Pb, N, O - # of atoms: 1, 2, 6 - Total # of atoms: 9 - The 3 is a subscript 12) - # of molecules: 4 - # of elements: …
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potassium chloride is a salt held together by ionic bonds. answer the f…
What is the charge on the potassium ion? +1 What is the charge on the chloride ion? -1 How many potassium ions are in one molecule of potassium chloride? 1 How many chlorine ions …
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question 15 0.25 pts which of the following elements may react chemical…
H, Al
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question 13 0.25 pts for the chemical reaction: 2h2 + o2 --> 2h2o which…
Question 13: A. $H_2$ B. $O_2$ Question 14: B. carbon dioxide D. water
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the bonds labeled with a \1\ in the diagram are: nonpolar covalent bond…
Hydrogen bonds
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question 7 of 15 how many grams of hno₃ are in 2.905×10²² molecules of …
$3.04$
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29. which scientist created the 1st periodic table? 30. which scientist…
29. Dmitri Mendeleev 30. Niels Bohr 31. Ernest Rutherford 32. The number of valence electrons increases by 1 (from 1 to 8 for main - group elements). 33. The number of energy leve…
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read the passage from sugar changed the world. we all crave sweetness, …
D. Sugar cane is no longer the main source of sweetness for most people.
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which ones are metals, non - metals or metalloids: 21. very good conduc…
21. Metals 22. Non - metals 23. Non - metals 24. Non - metals 25. Metals 26. Metals 27. Metalloids 28. Metals
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match the bond type with its description ionic choose polar covalent bo…
Ionic: Bond formed by transfer of electrons between atoms creating ions. Polar covalent bond: Unequal sharing of electrons between atoms due to electronegativity difference. Nonpo…
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question 7 how many electrons are in the valence shell of an uncharged …
Question 7: 2 Question 8: O - H, C - H, N - H, C = O
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what will the charge be on a stable magnesium ion? -2 +2 -1 0 +1 questi…
Question 1: B. +2 Question 2: 6, 4
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question 3 0.25 pts how many neutrons does fluorine have? question 4 0.…
Question 3: 10 Question 4: 9
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section b: you may draw arrows to help you if you want but it is not re…
| Chemical Formula | # of Molecules | # of Elements | Names of Elements | # of Atoms | Total # of Atoms | Coefficient/Sub - script | |---|---|---|---|---|---|---| | 3Na₂SO₄ | 3 | …
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5. practice: turn off show electron dot diagram. use the gizmo to creat…
H: H•; He: :He:; Li: Li•; Be: :Be:; B: •B• •; C: •C• • •; N: •N• • • •; O: :O• • • •; F: :F• • • • •; Ne: :Ne:; Na: Na•; Mg: :Mg:; Al: •Al• •; Si: •Si• • • •
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5. practice: turn off show electron dot diagram. use the gizmo to creat…
Which element has similar properties to lithium? Sodium (Na) Beryllium? Magnesium (Mg) Explain: Elements in the same group have the same number of valence electrons and thus simil…