1. Chapter 2 Homework ANSWERS
2.18) Sn d = 2.8 * 10 -8 cm r = ½ * d = 1.4 * 10 -8 cm
a)
−8 1m 1010 A
1.4 *10 cm * * = 1.4 A
100cm 1m
1m
1.4 * 10 −8 cm * = 1.4 * 10 −10 m
100cm
b)
1m 1um
d = 2.8 *10−8 cm * * − 6 = 2.8 *10− 4 um
100cm 10 m
atom
1 * 6um = 2.14 *104 atoms
2.8 *10− 4 um
c)
4
V = * Π * r 3 ⇒ r = 1.4 *10 −10 m
3
V = 1.33 * 3.14 * (1.4 *10 −10 m) 3
V = 1.4 *10 − 29 m 3
2. 2.26
65
Symbol Zn Ru Sr Ag U
Protons 30 44 38 47 92
Neutrons 35 57 49 61 143
Electrons 30 44 38 47 92
Atomic
65 101 87 108 235
Weight
2.44
Molecule Molecular Formula Empirical Formula
Benzene C6H6 CH
Silicone tetra Chloride SiCl4 SiCl4
diBorane B2H6 BH3
Glucose C6H12O6 CH2O
