化學
化學反應、化學計量、分子結構與元素性質。
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17. anna places an alka - seltzer tablet into a cup of hot water and an…
The cup with hot water will finish the reaction first because the rate of a chemical reaction increases with an increase in temperature.
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2. water is essential for life due to its unusual bent polar structure.…
a. Ionic compounds dissolve easily in water.
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part a can you recognize the chemical and physical changes that happen …
1. P 2. C 3. C 4. P 5. C 6. C 7. P 8. P 9. C 10. P
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identify the following as physical (p) or chemical (c) changes. 1. nacl…
1. P 2. C 3. P 4. P 5. C 6. C 7. P 8. P 9. C 10. P 11. C 12. C 13. C 14. P 15. C 16. P
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identify the following as a chemical (c) or physical property (p): 1. b…
1. P (blue color is a physical property) 2. P (density is a physical property) 3. P (flammability is a chemical property) 4. P (solubility is a physical property) 5. C (reacting w…
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part a can you recognize the chemical and physical changes that happen …
Part A: 1. P 2. C 3. P 4. P 5. C 6. C 7. P 8. P Part B: 1. P 2. P 3. C 4. P 5. C 6. C 7. P 8. P 9. C 10. P 11. P 12. P 13. P 14. C 15. C 16. P 17. P 18. C 19. C 20. C 21. P 22. C
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20) all of the following statements about different elements are true e…
20) B, C 21) B 22) D 23) D 24) B 25) A 26) A
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161 minutes remaining test content page 24 of 25 question 24 which of t…
C. steel
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13) which of the following statements about the nature of electrical ch…
13. E. All of the above statements are true. 14. E. none of the above 15. B. left side 16. B. halogens 17. A. alkaline earth metals 18. A. noble gases 19. C. a cation
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page 23 of 25 question 23 in a neutral atom the number of ______ is equ…
B. protons; electrons
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test content page 22 of 25 question 22 which of the following is a phys…
B. Shattering a glass bottle of hydrochloric acid, HCl
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read the passage. how do architects use math to ensure that their build…
The question encourages the reader to challenge preconceptions they might have about math being irrelevant to standards of beauty.
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15g 45 g→60 g 5.) n₂ + 3h₂→2nh₃ □ g 6 g→62 g
$56$
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3.) h₂o + so₃ → h₂so₄ 15g blankg → 60 g 7.) na₂ + h₂so₄ → na₂so₄ + h₂ 2…
3.) $45$ 7.) $21$ 9.) $35$
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true/false. write t if the statement is true and f if the statement is …
1. T 2. F 3. F 4. F 5. T 6. T 7. T 8. F 9. T 10. F 11. C. Most of the atom's mass and all of its positive charge is contained in a small core called the nucleus. 12. B. Most all o…
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5. 2al + 2hcl → 3h₂ + 2alcl₃ al = 2 h = 2 cl = 2 al = 2 h = 6 cl = 6 ye…
7. Sn: 2, H: 8, O: 4; Sn: 2, H: 6, O: 3; No 9. N: 2, H: 6, O: 4; N: 1, H: 2, O: 2; No
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test content page 19 of 25 question 19 valence electrons are the electr…
B. False
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select all the sentences that use the word inherent correctly. after a …
C. The inherent value of a summer job is that it teaches you about the importance of hard work and responsibility. D. Despite the project's inherent challenges, she remained optim…
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test content page 18 of 25 question 18 generally, ______________ elemen…
B. noble gas
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167 minutes remaining test content page 17 of 25 question 17 which elem…
A. F, Br, I
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instructions: count the atoms on the reactant side of the equation and …
1. $H = 6$, $O = 2$ (reactants); $H = 4$, $O = 2$ (products); No 3. $N = 2$, $H = 6$ (reactants); $N = 2$, $H = 6$ (products); Yes 5. $Al = 2$, $H = 2$, $Cl = 2$ (reactants); $Al …
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question 15 the number of valence electrons in an element with electron…
C. 6
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head socks are designed to prevent which type of materials from damagin…
Dust and refinish material particles
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question 14 what is the difference between co and co? a nothing; co and…
B. CO is carbon monoxide, a compound containing carbon and oxygen. Co is an element
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question 13 where is most of the mass of an atom concentrated? a nucleu…
A. nucleus
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determine the mass, in grams, that are in 5.32×10²² molecules of co₂?
$3.89$ g
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quiz a qualitative fit test is a subjective, or opinion - based test th…
A. True
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review what you learned in foods 1 define the term food - borne illness?
Food - borne illness is an illness resulting from the ingestion of food contaminated with pathogens (such as bacteria, viruses, parasites), toxins, or chemicals.
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3 multiple choice 1 point what does the section the atoms show the read…
how the number of protons in an element affects where it is on the periodic table
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question 6 of 10 which of these uses ethos? a. yum organics has been pr…
A. Yum Organics has been providing well - rounded organic lunches to schools on the West Coast for more than 15 years.
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4. what are the 3 rules for naming acids? rule 1: rule rule 2: rule 3: …
Rule 1: Binary acids are named with "hydro -" prefix, non - metal root, and "-ic acid" suffix. Example: HCl is hydrochloric acid. Rule 2: Oxyacids with "-ate" anions are named by …
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19. bruno sees his lab partner mariah sneak into the science storage cl…
Yes. Mariah should not go in the science storage closet.
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unit 1: measurements - si units and unit conversions 1) si units: direc…
1. k 2. e 3. m 4. b 5. g 6. f 7. c 8. d 9. o 10. l 11. j 12. a 13. i 14. h 15. n 16. q 17. p
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17. in 1928, alexander fleming discovered a mold growing in one of his …
17. C. It led to investigations of other molds as possible sources of antibiotics. 18. C. C 19. C. Science views unexplained evidence suspiciously.
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2. fill in the table with each hydrated ionic compound formula scf₂·3h₂…
| Formula | Name | |--|--| | Cu(III)SO₄·5H₂O | Copper(III) sulfate pentahydrate | | MgSO₄·8H₂O | Magnesium sulfate octahydrate | | ScF₂·3H₂O | Scandium(II) fluoride trihydrate | |…
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question which of the following functions is not associated with the sk…
C. Synthesis of B vitamins
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practice problems: rules for equations: a) atoms must be equal on both …
a) $4P + 5O_2 = 2P_2O_5$ b) $FeCl_3+3NaOH = Fe(OH)_3 + 3NaCl$
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13. fill in the table below for ionic compounds with multivalent ions. …
| Formula | Name | | ---- | ---- | | $V(III)Br_3$ | Vanadium(III) Bromide | | $Ni(II)_3P_2$ | Nickel(II) Phosphide | | $Fe(II)O$ | Iron(II) Oxide | | $Fe(III)_2O_3$ | Iron(III) Ox…
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3. what is the relationship between the number of protons and the numbe…
In a neutral atom, the number of protons is equal to the number of electrons.
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11. fill in the table below for compounds with polyatomic ions. name: a…
| Name | Formula | |--|--| | Lithium Dichromate | $Li_2Cr_2O_7$ | | Calcium Sulfate | $CaSO_4$ | | Scandium(III) Nitrate | $Sc(NO_3)_3$ | | Silver Nitrate | $AgNO_3$ | | Ammonium …
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10. determine the formulas of each compound below: name: potassium sulf…
Potassium Sulfide: $K_2S$ Magnesium Bromide: $MgBr_2$
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define atomic mass number. what is the relationship between
The atomic mass number is the sum of the number of protons and neutrons in the nucleus of an atom.
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define atomic number. purpose: to determine infor
The atomic number is the number of protons in the nucleus of an atom.
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9. name each compound below: al3s2 au2o cacl2 naf name formula
Aluminum sulfide Gold(I) oxide Calcium chloride Sodium fluoride
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select the appropriate words from the list to fill in the blanks. a sol…
saturated solubility molar solubility solubility product
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abbey always gets zits on her chin and she cant figure out the best met…
1. Face - washing method 2. Number of zits on her chin 3. Using an acne face wash from the pharmacy will clear up zits on the chin faster than soap and water, organic oils, or jus…
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8. define each term: | |definition|examples| |--|--|--| |cation:|| |ani…
| | Definition | Examples | |--|--|--| | Cation | A positively - charged ion | $Na^+$ | | Anion | A negatively - charged ion | $Cl^-$ |
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7 multiple answer 1 point click all 3 of the properties of a metalloid.…
Brittle, Semiconductor, Shiny
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3. which of the following statements explains why atoms are always neut…
d. They have the same number of protons as electrons.
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2025 - quiz chapters 11 & 12 1. central chemoreceptors located in the m…
1. A. slight increases in carbon dioxide or a decrease in the pH of the cerebrospinal fluid. 2. C. have pulmonary edema and can follow verbal commands. 3. A. It forces the alveoli…
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2 multiple answer 1 point click all 5 of the properties that metal have…
B. Solid, C. Malleable, D. Ductile, E. Conductors
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2. which of the following statement(s) are true about the atoms of any …
a. The number of protons in an atom of an element is unique to each element. c. A proton is an atom of one element that is identical to a proton in an atom of another element.
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2. which of the following statement(s) are true about the atoms of any …
a. The number of protons in an atom of an element is unique to each element.
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1 multiple choice 1 point most of the periodic table is made of what ty…
B. Metals
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question 4 of 4 match the term related to the career options for cosmet…
trains stylists and salon staff to understand and use the company’s hair care, haircolor and other chemical service products - Manufacturer educator has experience, confidence, ad…
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7. describe how you can produce each type of spectra. a spectrum type e…
A. Emission spectrum: Produced by atoms/molecules transitioning from higher to lower energy states and emitting photons. B. Absorption spectrum: Produced when photons are absorbed…
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read this passage. identify tone and mood. from the onset of adolescenc…
Tone: Matter - of - fact; Mood: Discomfort and intrusion
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select the solvent that will most effectively dissolve nacl. o ch₃ch₂oh…
$CH_3OH$
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in chemistry, ph is a logarithmic scale used to specify the acidity or …
$5.01\times10^{-12}$
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which statement best describes evidence that a chemical reaction occurs…
The cake rises as gas bubbles form in the baking cake
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the molar mass of the solute can be determined by measuring which other…
$91.8g/mol$
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the atomic number comes from... a. the number of protons. b. the number…
A. the number of protons.
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what makes up the atomic mass? a. electrons + neutrons b. electrons + p…
C. protons + neutrons
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the number of protons is equal to... a. the atomic mass. b. the number …
B. the number of electrons.
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a gas has a henrys law constant of 7.80×10⁻⁴ m/atm at 18.3 °c. what vol…
106 L
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a metal, m, of atomic mass 56 amu reacts with chlorine to form a salt t…
The formula of the salt is $MCl_2$.
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an aqueous solution is saturated in both oxygen gas and potassium iodid…
Potassium iodide will crystallize out of the solution, and no oxygen gas will bubble out.
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determine the vant hoff factor (i) for the following solutions. assume …
$1.128\ M\ \ce{C2H5OH}: i = 1$ $0.30\ M\ \ce{NaCl}: i = 2$ $0.052\ M\ \ce{CaBr2}: i = 3$ $0.073\ M\ \ce{Mg(NO3)2}: i = 3$
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the equation used to calculate the change in freezing point ($delta t_{…
As the temperature of a solution changes, its volume will also change, which will affect its molarity but not its molality.
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when sodium carbonate, na₂co₃, dissolves in water, what ions are produc…
$2Na^{+}+CO_3^{2 -}$
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# protons # electrons # neutrons
# protons: 16 # electrons: 16 # neutrons: 16
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an aqueous sodium acetate, nac₂h₃o₂, solution is made by dissolving 0.4…
$0.659$
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36 kr krypton 83.798 # protons ____ # electrons ____ # neutrons ____
# protons: 36 # electrons: 36 # neutrons: 48
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calcium (ca) is in the second column of the periodic table and is class…
C. $CaI_{2}$
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what would be the correct balanced formula for a compound made from alu…
C. $Al_2S_3$
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what is the metallic ion in the compound cucl₂? a. cu² b. cu` c. cu⁺ d.…
D. Cu²⁺
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each of the identical volumetric flasks contains the same solution at t…
A. molarity
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when one mole of sodium bicarbonate is formed from its elements, 947.7 …
The correct chemical equation representing the formation of one mole of sodium bicarbonate from its elements with the release of 947.7 kJ of energy is \(Na(s)+\frac{1}{2}H_{2}(g)+…
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each of the identical volumetric flasks contains the same solution at t…
A. molarity
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which of the following best describes the properties of an ionic compou…
C. high melting point, tendency to transfer electrons, electrolyte
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the melting point of water is 0°c. which statement best predicts whethe…
C. Water is more likely a covalent compound because water has a low melting point.
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1 waters chemical formula is h₂o. what does this mean? (a) water is mad…
A. Water is made up of H₂O molecules
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what leads to the formation of a covalent bond? a. the transfer of elec…
B. the sharing of an electron pair
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the thermochemical equation that represents the molar enthalpy of forma…
A. $C_2H_5OH(l)+277.1\ kJ ightarrow2C(s)+3H_2(g)+\frac{1}{2}O_2(g)$ (re - written in the form showing the formation of ethanol from its elements with the correct enthalpy value)
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insert dashes where needed. at sunfest organic farm a cutting - edge he…
At Sunfest Organic Farm - a cutting - edge herb farm in Okeechobee, Florida - the herbs are washed with ultraviolet light in a vacuum - sealed room.
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assuming equal concentrations and complete dissociation, arrange these …
Highest freezing point: $NaNO_3(aq)$ $K_2SO_4(aq)$ $K_3PO_4(aq)$ Lowest freezing point: $Al_2(SO_4)_3(aq)$
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based on the location of the elements magnesium (mg) and bromine (br) i…
It has a high melting point.
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for each solute, identify the better solvent: water or hexane. water, h…
$N_2$: Hexane $NaCl$: Water $CH_3NH_2$: Water $SO_2$: Water $C_7H_{16}$: Hexane
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identify the principal type of solute - solvent interaction in a soluti…
1. C. dispersion forces 2. A. ion - dipole interactions
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compound boiling point (k) nacl 1,738 pcl3 349 co2 195 libr 1,538 cao 3…
Boiling points for ionic compounds are higher than boiling points for covalent compounds.
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identify the principal type of solute - solvent interaction in a soluti…
1. C. hydrogen bonding 2. D. ion - dipole interactions
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the enthalpy of solution of nacl in water is about 3.88 kj/mol. however…
the entropy increases when NaCl dissolves in water
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select two of the following compounds that are covalent. a. cacl₂ b. p₂…
B. $P_2O_5$
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question 4 of 29 calculate the vapor pressure of benzene, c₆h₆, at 25 °…
$P_{benzene}=73.92$ torr $P_{toluene}=6.21$ torr
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calculate the boiling point ($t_{b}$), in degrees celsius, for a soluti…
$104.11^{\circ}C$
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the diagram models a type of bond between atoms. which best describes t…
Covalent bond
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what leads to the formation of a covalent bond? a. the transfer of elec…
B. The sharing of an electron pair
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two balloons hold two different gases. the gases are held at the same p…
the mass of each gas
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extension: the periodic table get the gizmo ready: - create a neutral h…
1. The elements are arranged by increasing atomic number, which shows trends in their properties. 2. H: 1 dot; He: 2 dots; Li: 1 dot; Be: 2 dots; B: 3 dots; C: 4 dots; N: 5 dots; …
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activity b: electron arrangements get the gizmo ready: * create a neutr…
1. Electrons are arranged in energy levels around the nucleus. 2. A. 2 B. 8 C. 8 3. 1 4. One dot around the symbol Li. 5. For H: One dot around the symbol H. For He: Two dots arou…