1. Circle the atom in each pair that has a larger radius.
a. Sn, Sr b. Na, Rb c. S,P d. B, Al e. Mg, Na f. Al, B
g. F, N h. Cl, I i. Mg, Be j. Pa, U k. Au, Ba l. K, Ca
m. Br, Cl n. Ne, Ar
2. Circle the particle in each pair that has a larger radius.
a. Ca, Ca
2+
b. As
3-
, P
3-
c. Mg
2+
, Be
2+
d. C, C
4-
e. Fe, Fe
3+
f. Se
2-
, Kr g. F
-
, Cl
-
h. Pb
4+
, Pb i. Te
2+
, Te j. Ag, Ag
-
k. S
2-
, S l. Br
-
, Se
2-
3. Circle the atom in each pair that has a lower first ionization energy.
a. N, O d. C, Ge g. I, Sb
b. Te, Sn e. Br, I h. Al, N
c. Ne, F f. Mg, Ca i. F, S
4. Circle the element would have the highest 1
st
ionization energy? Na, Mg, Al
Circle the element would have the highest 2
nd
ionization energy? K, Ca, Ga
Circle the element would have the highest 3
rd
ionization energy? Be, B, C