化學
化學反應、化學計量、分子結構與元素性質。
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show instructions question 1 a. h2n - c - c - oh r b. ch2oh ch2oh o ho …
B. Option B
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a 53.81 gram sample of copper is heated in the presence of excess oxyge…
$Cu_2O$
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a 5.775 - gram sample of iron is heated in the presence of excess chlor…
FeCl₃
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an alcohol is 58.80 % c and 9.889 % h by mass. the rest is oxygen. what…
$C_5H_{10}O_2$
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use the references to access important values if needed. the percent by…
$61.18$
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use the references to access important value. calculate the percentage …
Mass percentage of nitrogen = 30.43% Mass percentage of oxygen = 69.57%
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the percent by mass of copper(ii) in cu(no2)2 is %.
$40.85$
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1. how many grams of k⁺ are present in 4.73 grams of potassium nitrate?…
1. 1.83 g 2. 5.51 g
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part 3a 12 marks choose 4 of 5 (lesson 3a) draw the following ionic bon…
a) Formula: $Li_3P$; Ionic - bond drawing: 3 $Li^+$ around 1 $P^{3 -}$ with electron - transfer arrows. b) Formula: $CaCl_2$; Ionic - bond drawing: 1 $Ca^{2+}$ with 2 $Cl^-$ aroun…
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1. how many grams of barium chloride are present in 4.08 moles of this …
1. 850.57 grams 2. 0.0225 moles
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safety with materials a chemical purchased in canada. (sds) must be pro…
1. To provide hazard and safety - related information for chemicals. 2. Chemical substances, mixtures, and some chemical - containing products. 3. Categorized into multiple sectio…
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part 2d 3 marks choose 3 of 4 (lesson 2b) draw the lewis dot diagrams o…
a) Po with 6 dots around it b) Rn with 8 dots around it c) Sr with 2 dots around it
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1. how many grams of sodium chloride are present in 2.39 moles of this …
1. 139.6716 2. 0.0385
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use the references to access important values if needed for this questi…
1. $310.1$ grams 2. $0.0345$ moles
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use the references to access important values if needed for this questi…
256
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carbon monoxide gas can be described as all of the following except col…
B. visible
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use the references to access important values if needed for this questi…
A sample of Ga weighs less than 60.7 grams. Mass = 53.4 g Ga
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working with various chemicals... - if any part of your body comes in c…
- If any part of your body comes in contact with a substance, wash it immediately and thoroughly with water. - If you get anything in your eyes, do not touch them. Wash them immed…
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what chemical group is highlighted in pink in the molecule pictured bel…
Hydroxyl
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contaminated by foreign substances occurs when what’s on my food? milk …
Chemicals are not rinsed from foods before processing
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q1. physical properties can be observed and measured without changing t…
Q1: D. All of the above Q2: C. Flammability Q3: D. Mass Q4: A. Chemical property
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all ionic compounds 1. write the formula for each compound (don’t forge…
1) $Ca(C_{2}H_{3}O_{2})_{2}$ 2) $KCl$ 3) $(NH_{4})_{2}CO_{3}$ 4) $Na_{3}N$ 5) $Ti(ClO)_{4}$ 6) $Fe_{2}S_{3}$ 7) $ZnCr_{2}O_{7}$ 8) $PtO_{2}$ 9) $Al(OH)_{3}$ 10) $Hg(NO_{3})_{2}$ 1…
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herbicides are not considered as chemical hazards. do you also eat thes…
False
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for a chemistry demonstration, malik is mixing sodium hydroxide with vi…
D. \(4x+6y\leq0\)
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which refers to the amount of heat required to change the temperature o…
B. Specific heat
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heat is most closely related to which kind of energy? nuclear electrica…
C. thermal
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heat transfer between two substances is affected by specific heat and t…
amount of time and area of physical contact between the substances.
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in this section, you learned that all body matter is eventually replace…
1. Our body's matter - replacement shows we are part of biogeochemical cycles, exchanging elements. 2. Reducing fossil - fuel use, reforestation. 3. Increased evaporation, altered…
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in this section, you learned that all body matter is eventually replace…
1. Our body's matter replacement indicates our active role in biogeochemical cycles. 2. Reducing fossil - fuel consumption, Planting more trees. 3. Increased evaporation, altered …
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question 5 (2 points) what is the net ionic equation for the reaction o…
$Fe^{2+}(aq)+CO_3^{2 - }(aq) ightarrow FeCO_3(s)$
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question 4 (2 points) which of the following is a precipitation reactio…
$\text{Pb}(\text{C}_2\text{H}_3\text{O}_2)_2(\text{aq})+2\text{NaCl}(\text{aq}) ightarrow\text{PbCl}_2(\text{s}) + 2\text{NaC}_2\text{H}_3\text{O}_2(\text{aq})$
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question 3 (2 points) which of the following pairs of aqueous solutions…
LiOH + CuBr2
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question 2 (2 points) which of the following compounds is not soluble i…
PbCl₂
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question 1 (2 points) which of the following compounds is soluble in wa…
$Na_3PO_4$
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given the period and group, you should be able to identify the followin…
30. V 31. He 32. Pb
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the groups are the vertical columns on the table. identify the groups o…
25. Group 1 26. Group 13 27. Group 4 28. Group 10 29. Group 17 30. V 31. He 32. Pb
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the periods are the horizontal rows on the table. identify the period o…
20. 3 21. 5 22. 1 23. 2 24. 4
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iii by looking at the atomic number we are able to observe how many pro…
14, 13, 43, 10, 29, 26
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the periodic table also can tell us the atomic mass of elements. please…
10. 40.08 11. 6.94 12. 207.2 13. 26.98
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1. the periodic table contains chemical symbols for all elements. pleas…
1. He 2. N 3. K 4. Cu 5. Ne 6. Pu 7. H 8. I 9. Au
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average atomic mass why? most elements have more than one naturally - o…
1. 12 2. 24, 25, 26 3. No, because they are isotopes. 4. | Mass Number | Number of Atoms | | ---- | ---- | | 24 | 12 | | 25 | 6 | | 26 | 2 | 5. The isotope with mass number 24. 6.…
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1. write in the atomic number for each mg atom in model 1. 2. what are …
1. 12 2. 24, 25, 26 3. No. Isotopes have different numbers of neutrons, so different atomic masses. 4. Table as shown above (values to be filled based on Model 1 data) 5. The isot…
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3. fill in the correct answer. a. what element/ion can be represented b…
a. Sulfur b. Nitrogen c. $_{23}^{48}V$ d. 26 e. 11 f. 38 g. 16 h. 80
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counting elements and atoms atoms •the smallest part of a chemical elem…
The number of atoms in a molecule of an element can be 1 (for single - atom elements) or 2 (for common di - atomic elements) or more. The number of atoms in a molecule of a compou…
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use the following table. (if no information is given about charges or e…
See the above - filled table.
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practice molecular compound name|formula 1|cbr₄ 2|trisulfur octafluorid…
1. Carbon tetrabromide 2. Diphosphorus hexahydride (P₂H₆) 3. N/A (wrong formula for tetracarbon decahydride) 4. Ethane (C₂H₆) 5. N/A (wrong formula for dihydrogen monoxide) 6. Tet…
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what volume of 18.0 m h₂so₄ is needed to make 0.900 l of a 6.00 m solut…
B. 0.300 L
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question 4 (2 points) identify the substance that is a weak electrolyte…
C. $NH_3$
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question 3 (2 points) what is the molarity of a solution of 152.7 grams…
0.64
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question 2 (2 points) how many grams of nacl (mm = 58.44 g/mol) are req…
$83.3\ g$
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question 1 (2 points) what conversion factor can be written for a 0.50 …
$\frac{0.50\ mol\ KBr}{1\ L\ KBr\ solution}$
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question 17 1 pts what type of diagram is a graphical representation of…
Question 17: A. topology map Question 18: False
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determine the molar mass of al₂(so₄)₃·5 h₂o(s). provide an answer to tw…
432.27 g/mol
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1 of the three elements shown in the tables above, which element do you…
Without the actual table of the three elements, a specific element cannot be named. However, the best choice would be an element with a high melting point and low reactivity, like…
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true or false 15. classifying matter by state is a simple and reliable …
15. False 16. False 17. True 18. True 19. True 20. False 21. True 22. True 23. True 24. False
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13. what is the difference between the molecules of a compound? 14. whi…
13. Atoms are basic units of elements, and compound molecules are composed of different - type atoms bonded. 14. Nuclear changes (nuclear fission and fusion).
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3 how many energy levels does each atom, shown in the table below, have…
| Elements | What row of the periodic table is this element on? | Number of Energy Levels | What column of the periodic table is this element in? | Valence Electrons | |--|--|--|-…
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atomic structure & reactivity 1 mr. pauling needs you to prepare inform…
| Elements | Number of Protons | Number of Electrons | | ---- | ---- | ---- | | Aluminum | 13 | 13 | | Silicon | 14 | 14 | | Beryllium | 4 | 4 | | Elements | Rounded Atomic Mass |…
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use what you learned about macromolecules to answer the questions below…
1. For the meal eaten today, if it was a balanced meal, it likely contained carbohydrates (e.g., bread, rice which are broken down into glucose for energy), proteins (e.g., meat, …
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8. would you do more work lifting a box from the floor to the top of a …
8. More work is done lifting the box from the floor to above your head because the distance of the lift is greater. 9. The rock thrown at the glass is more likely to break it beca…
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you will need to construct a flowchart or write out a procedure for the…
1. Around 338 °C 2. A separation technique where a liquid is carefully poured off from a mixture, leaving a solid or denser liquid behind.
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8. should you do more work lifting a box from the floor to the top of a…
8. You do more work lifting a box from the floor to a shelf above your head because work $W = Fd$ and the distance $d$ is greater. The thrown rock is more likely to break the glas…
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8. do you do more work lifting a box from the floor to the top of a tab…
825 ft - lb
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which of the following best describes a polar covalent bond? a bond in …
A bond where electrons are shared unevenly between two atoms, resulting in a partial charge.
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which of the following best describes an ionic bond? a bond formed when…
A bond formed when one atom transfers electrons to another, creating charged ions.
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methyl butyrate (component of apple taste and smell): 58.80%c, 9.87%h, …
Part A: $C_{5}H_{10}O_{2}$ Part B: $CH_{2}O$
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learning goal: to use combustion analysis data to determine an empirica…
Part A: Value: 0.217 Units: mol Part B: Value: 0.433 Units: mol
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part c 2.20×10⁻² mol h₂co₃ view available hint(s) moles of oxygen = mol…
Part C: $6.60\times 10^{-2}$ Part D: $45.4$
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a neutral atom has 53 protons and 74 neutrons. what is its mass number?…
A. 127
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33 multiple choice 1 point how many neutrons are in sulfur - 34? 18 34 …
18
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part a 4.63 mol of h₂o₂ view available hint(s) moles of oxygen = mol su…
Part A: 9.26 mol Part B: 2.00 mol
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single - charge cations write the name of each of the following compoun…
1. Sodium sulfide 2. Aluminum oxide 3. Sodium chloride 4. Potassium iodide 5. Zinc bromide 6. $AlCl_{3}$ 7. $ZnO$ 8. $BaBr_{2}$ 9. $Li_{3}N$ 10. $K_{2}S$
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32 multiple choice 1 point isotopes of an element differ in the number …
B. Neutrons
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6. test your understanding of isotopes by examining the following: | at…
1. Isotopes 2. Same Atom, Not Isotopes of Each Other 3. Isotopes 4. Isotopes 5. Different Element
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which subatomic particle is involved in chemical bonding? neutron proto…
C. Electron
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29 multiple choice 1 point which subatomic particles are responsible fo…
D. Protons and neutrons
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28 multiple choice 1 point what is the general formula of a monosacchar…
A. $C_6H_{12}O_6$
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in a student experiment, the empirical formula of a copper halide was f…
CuCl
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c. oxygen - 14 3. list all of the things that are the same about these …
3. Number of protons, element identity. 4. Number of neutrons, mass - number. 5. Same number of protons, different number of neutrons. 6. No specific answer as pairs of atoms are …
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1. play with the simulation to determine: a. which particles affect the…
1a. Neutrons and protons 1b. Electrons 2a. Oxygen - 16 2b. Oxygen - 17 2c. Oxygen - 18
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10.9 kg k₂co₃ express your answer in formula units to three significant…
$4.75\times10^{25}\ K_2CO_3\ formula\ units$ ### Part B:
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the periodic table scavenger hunt instructions: write the atomic number…
1. Sodium (Na), Atomic number 11 2. Neon (Ne), Atomic number 10 3. Bohrium (Bh), Atomic number 107 4. Titanium (Ti), Atomic number 22 5. Krypton (Kr), Atomic number 36 6. Polonium…
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2. create a definition (using a complete sentence) for each of these it…
a. The element symbol is a one - or two - letter abbreviation representing a chemical element in the atomic symbol. b. The charge in an atomic symbol shows the net electrical char…
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1. using the symbol readout box, figure out which particles affect each…
| Position in symbol box | Term to describe this information | Particle used to determine this | How the value is determined | | ---- | ---- | ---- | ---- | | a | Element symbol |…
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label the parts of an atom on the diagram below. 4. what type of charge…
4. Positive charge 5. No charge 6. Negative charge 7. Protons and neutrons 8. 35 9. [Number of protons in the diagram] 10. [Sum of protons and neutrons in the diagram] 11. 15 12. …
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79 au 196.967 # of protons ____ # of neutrons ____ # of electrons ____ …
Au: Protons: 79, Neutrons: 118, Electrons: 79 F: Protons: 9, Neutrons: 10, Electrons: 9 Si: Protons: 14, Neutrons: 14, Electrons: 14 Ag: Protons: 47, Neutrons: 61, Electrons: 47 T…
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1. go to the website: phet.colorado.edu. click on html5 simulations on …
1. a - c (answers may vary based on simulation observations) 2. Protons and neutrons are found in the center of the atom. 3. Protons determine the name of the element. 4. a. Lithi…
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question 33 the term \functional\ is used in the phrase \functional gro…
D. help determine the chemical properties of an organic molecule.
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an atom that has an electrical charge is called a(n) a ion. b molecule.…
A. ion
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instructions: label the parts of the periodic table for the oxygen atom…
| Element | # of Protons | # of Neutrons | # of Electrons | | ---- | ---- | ---- | ---- | | Oxygen (O) | 8 | 8 | 8 | | Zinc (Zn) | 30 | 35 | 30 | | Lithium (Li) | 3 | 4 | 3 | | Bo…
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vocabulary assessment wk 6 the ____________ is the sum of all the force…
Net Force
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vocabulary assessment wk 6 ________ is an movement or change in positio…
Motion
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energy is the energy stored in atoms and the chemical bonds between the…
Chemical Potential
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energy, also known as elastic energy, is the energy stored in an elasti…
Law of Conservation of Energy
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energy is the energy possessed by an object due to its position in a gr…
Gravitational Potential Energy
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__________ energy is the total amount of potential and kinetic energy i…
Mechanical
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energy is the energy of motion. gravitational potential law of conserva…
Kinetic
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energy is stored energy. gravitation potential law of conservation of e…
C. Potential
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assignment b. the carbon cycle process the carbon cycle process rewatch…
carbon dioxide, methane
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answer the following questions. 6. lead has an atomic number of 82. how…
6. 82 protons, 82 electrons 7. 8 protons 8. 30 9. 85 10. 104 protons, 104 electrons 11. 84 protons, 84 electrons 12. 102 protons, 102 electrons 13. 19 protons, 19 electrons, 20 ne…