Chapter 2 Key - Chapter 2 Homework 1 a b 2 a b c 3 Element...

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Chapter 2 Homework 1. a. 0.118 ppm = 118 ppb – yes, detectable b. 25 ppm = 25,000 ppb – yes detectable 2. a. allotropes b. not allotropes c. allotropes 3. Element # of protons # of electrons N 8 8 O 7 7 Mg 12 12 S 16 16 Zn 30 30 4. Number of protons Name Symbol 2 Helium He 19 Potassium K 29 Copper Cu 46 Palladium Pd 5. Element Symbols # of p # of n # of e - Oxygen-18 O-18 O 18 8 8 10 8 Sulfur-35 S-35 S 35 16 16 19 16 Uranium-238 U-238 U 238 92 92 146 92 Bromine-82 Br-82 Br 82 35 35 47 35 Neon-19 Ne-19 Ne 19 10 10 9 10 Radium-226 Ra-222 Ra 226 88 88 138 88 6. a, c, d, and f are true. b and e are false. 7. All atoms are most stable when they have a full valence (outer) electron shell. This is 8 electrons for most elements, 2 for H and He. If an element does not have a full shell on its own it can get a full shell by sharing electrons with other elements. The shared electrons form bonds.
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8. a.
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Chapter 2 Key - Chapter 2 Homework 1 a b 2 a b c 3 Element...

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