Answer to Question #98438 in General Chemistry for Brittany Wallace

Question

1. What is the ground state electron configuration for a antimony atom?
a. [Kr] 5s2 5p3
b. [Kr] 5s2 5d10 5p5
c. [Kr] 4f14 5s2 5p3
d. [Kr] 5s2 5d10 5p3
e. [Kr] 4d10 5s2 5p3

2. Determine which ion below is not paramagnetic.
A. Cd2+
B. Fe3+
C. Mn4+
D. Mn2+
E. Ni2+

3. In general, in which direction on the periodic table do the atomic radii of the elements decrease?
A. down each column and across each row, right to left
B. up each column and across each row, left to right
C. across each row, left to right, but not up or down any column
D. up each column, but not across any row

Answer 1

1)What is the ground state electron configuration for a antimony atom? 

Answer: e. [Kr] 4d10 5s2 5p3  

2) Determine which ion below is not paramagnetic:

a) Cd2+ - [Kr] 4d10 (no unpaired electrons - not paramagnetic)

b) fe3+ - [Ar] 4d5 (5 unpaired electrons - paramagnetic)

c) Mn2+ - [Ar] 3d3 (3 unpaired electrons - paramagnetic)

d) Mn4+ - [Ar]3d2 (2 unpaired electrons - paramagnetic)

e) Ni2+ - [Ar] 3d8 (2 unpaired electrons -paramagnetic)

Answer: a) Cd2+

3)In general, in which direction on the periodic table do the atomic radii of the elements decrease? 

Answer: B. up each column and across each row, left to right