Write the correct formula for the following

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23. Write the correct formula for the following combinations. (a) Mg and NO 3 (b) Al and S (c) Ca and OH (d) Fe 3+ and SO 4 (e) Sr and O 24. Which of the following cannot be accurately described by a Lewis structure with eight electrons around each atom? (a) Cl 2 (b) CF 4 (c) Xe F 2 18
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Answers: 1. (a) 4, 2, and 8 (b) 9, 24, 9 (c) 15 atoms 2. ( 19 X .4) + (22 X .6)= 20.8 3. (a) 11,12,11 (b) 17, 18, 18 (c) 20, 20, 18 4. S = [Ne] 3s 2 3p 4 Tc = [Kr]5s 2 4d 5 5. 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 10 4p 6 5s 2 4d 7 6. (a) 3 s, p, and d (b) 18 7. (a) 6 (b) 4 (c) 2 8. (a) Alkali Metals (b) Alkaline Earth Metals (c) Halogen (d) Transition metals (e) Noble Gases (f) Metalloid (g) Right of stair step starting under B. 9. (a) last box has one arrow (b) last three boxes have one arrow in each (c) last three boxes are full 10. 20, protons, 40, protons and neutrons 11. Fe 2+ [Ar] 3d 6 S 2- [Ne] 3s 2 3p 6 12. neutral, equal protons and electrons 13. has a charge, protons and electrons are not equal 14. the same element, different number of neutrons but the same number of protons. 15. Z = atomic number or protons A = mass number, protons and neutrons 16. 17. (a) ionic (b) covalent (c) ionic (d) covalent (e) ionic (Remember, two non-metals form a covalent bond and a metal and non-metal form an ionic bond.) 18. (a) 2 (b) 2 (c) 0
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19. (a) 4 (b) 6 (c) 4 20. (a) 8 ( b) 12 (c) 8 21. (a) 3+ (b) 2+ (c) 5+ 22. (a) 1+ (b) 2+ (c) 3+ (d) + or - 4 (e) 3- (f) 2- (g) 1- 23. (a) Mg(NO 3 ) 2 (b) Al 2 S 3 (c) Ca(OH) 2 (d) Fe 2 (SO 4 ) 3 (e) SrO 24. (c) - can't draw with 8 electrons around each atom ( H with 2). In other words, the central atom will have more than 8 around it.
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