Exam 3

What is the complete electron configuration for cadmium (Cd)? a) 1s22s22p63s23p64s23d104p65s24d10 b) 1s22s22p63s23p64s24d104p65s25d10 c) 1s22s22p63s23p64s23d104p65s24d105p1 d) 1s22s22p63s23p64s23d104p65s24d105p2

a) 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^6 5s^2 4d^10

How many centigrams (cg) are in 45.1 milligrams (mg)? a) 4.51 cg b) 0.451 cg c) 0.0451 cg d) 0.00451 cg

a) 4.51 cg

What is the best answer to report, to the correct number of significant figures, for the following calculation of an average mass? The 3 in the denominator is an exact number. 9.932 g + 8.805 g + 9.443 g /3 = ? a) 9.3933 g b) 9 g c) 9.39 g d) 9.393 g

a) 9.3933 g

Which neutral element has the electron configuration [Ar]4s13d10? a) Cu b) Ni c) Zn d) Cr

a) Cu

How many p orbitals are in the n = 5 level? a) 5 b) 3 c) 2 d) 1

b) 3

How many unpaired electrons does a neutral atom of cobalt (Co) have in its d orbitals? a) 7 b) 3 c) 0 d) 2

b) 3

What is in the nucleus of Selenium-78 (78Se)? a) 34 protons and 34 electrons b) 34 protons and 44 neutrons c) 78 protons and 44 neutrons d) 34 protons and 45 neutrons

b) 34 protons and 44 neutrons

A neutral atom of palladium-107 (107Pd) contains how many protons, neutrons, and electrons? a) 61 protons, 46 neutrons, 46 electrons b) 46 protons, 61 neutrons, 46 electrons c) 61 protons, 46 neutrons, 61 electrons d) 107 protons, 46 neutrons, 107 electrons

b) 46 protons, 61 neutrons, 46 electrons

How many valence electrons does a neutral atom of sulfur (S) have? a) 5 b) 6 c) 4 d) 8

b) 6

What is the name of the isotope 40 20 Ca? a) None of these is correct. b) Calcium-40 c) Calcium-60 d) Calcium-20

b) Calcium-40

Which of the following elements has the largest atomic radius? a) P b) Sb c) I d) Cl

b) Sb

Which of the following is the correct electron configuration for a scandium (Sc) atom? a) [Kr]5s24d1 b) [Ar]4s13d2 c) [Ar]4s23d1 d) [Kr]5s13d2

c) [Ar]4s^2 3d^1

Which one of the following is the correct symbol for rhodium-103? a) 45 58 Rh b) 103 58 Rh c) 45 103 Rh d) 103 45 Rh

d) 103 45 Rh

How many electrons can be contained in all of the orbitals in the n = 2 level? a) 2 b) 32 c) 4 d) 8

d) 8

Which neutral element has the electron configuration [Kr]5s24d6? a) Fe b) Tc c) Rh d) Ru

d) Ru