Periodic Properties Worksheet Key Page 4
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14. Which of the following is smaller?
2+
a) Mg, Mg
2+
Mg
Cations are smaller than the neutral
3+
b) Al, Al
atom because they have fewer
3+
Al
electrons. Removing electrons either
empties a larger subshell or reduces
+
c) Cs, Cs
the repulsion with a subshell.
+
Cs
15. Which of the following is larger?
2-
a) O, O
2-
O
Anions are larger than the neutral
atom because they have more
3-
b) P, P
electrons in the same subshell which
3-
P
causing increased repulsion. The
increased repulsion causes the
-
c) I, I
electrons to move further from each
-
I
other making the anion larger.
16. Arrange in order of increasing size
2+
3+
a) Fe, Fe
, Fe
3+
2+
Fe
, Fe
, Fe
Increasing number of electrons
causes increasing repulsion which
3+
4+
b) Ti, Ti
, Ti
causes increasing size.
4+
3+
Ti
, Ti
, Ti
-
2+
-
-
+
2+
3-
+
2-
+
2-
17. Arrange in order of increasing size: Br
, Ca
, Cl
, F
, Li
, Mg
, N
, Na
, O
, Rb
, S
First determine the number of electrons in each ion since each of these ions will
have the same number of electrons as a noble gas.
-
-
2+
-
-
-
-
-
+
-
2+
-
3-
-
Br
- 36 e
, Ca
- 18 e
, Cl
- 18 e
, F
- 10 e
, Li
- 2 e
, Mg
- 10 e
, N
- 10 e
,
+
-
2-
-
+
-
2-
-
Na
- 10 e
, O
- 10 e
, Rb
- 36 e
, S
- 18 e
Group the ions according to number of electrons. Size will increase according to
number of electrons (in the case of ions with noble gas electron configurations).
+
-
-
2+
3-
+
2-
-
2+
-
2-
-
-
+
-
Li
- 2 e
F
, Mg
, N
, Na
, O
- 10 e
Ca
, Cl
, S
- 18 e
Br
, Rb
- 36 e
Arrange ions in groups in order of decreasing nuclear charge which causes
decreased attraction and increasing size. Then put groups together.
+
2+
+
-
3-
2-
2-
-
2+
+
-
Li
, Mg
, Na
, F
, N
, O
, S
, Cl
, Ca
, Rb
, Br
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