6. Which of the following elements has the largest ionization energy?
a.
Na
b.
Ne
c.
F
d.
K
e.
Rb
7. Which of the following has the greatest electron affinity (most negative value)?
a.
Cl
b.
K
c.
He
d.
Na
e.
Rb
8. Which of the following species is not isolectronic with any of the others?
a.
V
3+
b.
Ca
2+
c.
Ar
d.
Cl
-
e.
S
2-
9. In Bohr's model of the hydrogen atom, the radius of an orbit
a.
is proportional to
n
2
.
b.
is smallest for the highest energy state.
c.
increases when a photon of light is emitted from an excited atom.
d.
can have any value that is larger than the ground-state radius.
e.
none of the above
10. Which of the following atoms is
not
a one-electron system?
a.
H
b.
He
+
c.
Li
2+
d.
Be
2+
e.
O
7+
11. Which of the following statements about periodic properties is incorrect?
a. Both electron affinity and ionization energy decrease down a group.
b. Atomic size increases to the right across a period.
c. Ionization energy increases to the right across a period.
d. Atomic size increases down a group.
e. Electron affinity increases to the right across a period.