University:
Campbell University
Course:
CHEM 111 | General Chemistry I
Academic year:

2021
Views:

80

Pages:

1
Author:

Knonycalonm0

KEY Atomic Mass, Atomic Number and Isotopes Name - ______________ 1.) How many protons are in the nucleus of each of the following? a.) Be 4 b.) U 92 c.) Mn 25 c.) Ar 18 2.) How many electrons are there in a neutral atom of each of the following? a.) C 6 b.) Fe 26 3.) How many electrons are there in each of the following atoms? a.) Na+ 10 c.) V3+ 20 e.) Cl- 18 g.) Sb3- 54 i.) H- b.) Mg2+ 10 d.) O2- 10 f.) Al3+ 10 h.) Fe2+ 24 j.) As3+ 30 2 4.) What is the ion produced when: a.) two electrons are added to S? S2- e.) an electron is added to Cr3+? Cr2+ b.) two electrons are removed from Ca? Ca2+ f.) two electrons are removed from Mn2+? Mn4+ c.) an electron is added to Cl? Cl- g.) an electron is removed from V4+? V5+ d.) three electrons are removed from Al? Al3+ h.) two electrons are added to Sb-? Sb3- 5.) What is the charge on the nucleus of each of the following? a.) Mg +12 b.) Ne +10 c.) K+ +19 d.) S2- +16 6.) The following mixtures of isotopes are found in nature. Calculate the average mass of each mixture. a.) 69Ga = 60.0%, 71Ga = 40.0% b.) 107Ag = 51.8%, c.) 70Ge = 20.5%, 109 72 0.600 × 69 + 0.400 × 71 = 69.8 Ag = 48.2% Ge = 27.4%, 0.518 × 107 + 0.482 × 109 = 108. 0 73 Ge = 7.8%, 74 Ge = 36.5%, 76 Ge = 7.8% 0.205 × 70 + 0.274 × 72 + 0.078 × 73 + 0.365 × 74 + 0.078 × 76 = 72.7 d.) 64Zn = 48.9%, 66 Zn = 27.8%, 67 Zn = 4.1%, 68 Zn = 18.6%, 70 Zn = 0.6% 0.489 × 64 + 0.278 × 66 + 0.041 × 67 + 0.186 × 68 + 0.006 × 70 = 65.5