Quantum Numbers Worksheet Key Page 3
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ATOMIC SIZE, IONIZATION ENERGY AND ELECTRON AFFINITY KEY
1. Complete the following table by writing the symbol for the element in each pair that has the largest
atomic size, highest ionization energy, and most favorable electron affinity. If they are about the same,
write “neither”.
Largest
Highest ionization
Most favorable
atomic size
energy
electron affinity
a. P or Bi
Bi
P
P
b. Mg or S
Mg
S
S
c. Cr or Mo
Mo
Cr
XXXXXX
d. V or Ni
neither
neither
XXXXXX
2. Identify each of the following as; (A) always negative (exergonic), (B) always positive (endergonic), or (C)
sometimes positive and sometimes negative.
B
a. the first ionization energy
B
b. the second ionization energy
C
c. the first electron affinity
B
d. the second electron affinity
3. Write the formulas for three cations and three anions that are isoelectric with argon and arrange them in
the order of increasing ionic size.
+
-
3+
2+
2-
3-
Sc
< Ca
< K
< Ar < Cl
< S
< P
CHEMISTRY 151
ATOMIC SIZE, IONIZATION ENERGY AND ELECTRON AFFINITY KEY
1. Complete the following table.
Higher ionization energy
Larger size
a. B or F
F
B
b. Na or Cs
Na
Cs
c. Ti or Ni
About the same
About the same
+
+
d. Mg
or Mg
Mg
Mg
3+
2+
3+
2+
e. Y
or Y
Y
Y
-
-
2-
2-
f. S
or Cl
Cl
S
2. Circle the formula in each pair that represents the atom with the most favorable electron affinity.
a. Cl or I
b. P or Cl
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