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Periodic Table and Trends Questions

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Periodic Table and Trends
1). Arrange the following elements in order of increasing atomic radius: Al, Na, P,
Mg, K
P, Al, Mg, Nam
.
2). Explain the trend in atomic radius along a single period in terms of atomic
structure.
As the size of the nucleus increases, the nuclear
= c/ ; the N/P ratio decreases.
3). Arrange the following groups of atoms in order of A). increasing size, B).
Ionization Energy, C). Electron Affinity.
a. Rb, Na, Be
b. Sr, Se, Ne
c. Fe, P, O
4). Rank each set of ions in order of decreasing size, and explain your ranking:
a. Ca
2+
, Sr
2+
, Mg
2+
b. K
+
, S
2-
, Cl
-
c. Au
+
, Au
3+
5). In each of the following sets, which atom or ion has A). the smallest ionization
energy, B). Electron Affinity?
a. Cs, Ba, La
b. Zn, Ga, Ge
c. In, P, Ar
d. Tl, Sn, As
6) . Compare the elements Na, B, Al, and C and place the elements in order of
increasing atomic radius.
----------------------------------------------------------------------------------
lowest Radius highest Radius

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Key:
1). Arrange the following elements in order of increasing atomic radius: Al, Na, P,
Mg, K
P, Al, Mg, Nam
PP < Al < Mg < Na < K.
2). Explain the trend in atomic radius along a single period in terms of atomic
structure.
As the size of the nucleus increases, the nuclear
The atomic radius decreases from left to right.
= c/ ; the N/P ratio decreases.
3). Arrange the following groups of atoms in order of A). increasing size, B).
Ionization Energy, C). Electron Affinity.
a. Rb, Na, Be
A). Be < Na < Rb
Note that the general patterns for first Ionization energy and electron affinity is the
opposite of the pattern for atomic radius.
B) Rb < Na < Be
C) Rb < Na < Be
b. Sr, Se, Ne
A). Ne < Se < Sr
B) Sr < Se < Ne
C) Sr < Se < Ne
c. Fe, P, O
A) O < P < Fe
B) Fe<P<O
C) Fe<P<O
4). Rank each set of ions in order of decreasing size, and explain your ranking:
d. Ca
2+
, Sr
2+
, Mg
2+
Sr
2+
> Ca
2+
> Mg
2+
e. K
+
, S
2-
, Cl
-
The positive ions are smaller and the negatives are larger
K
+
< Cl
-
< S
2-
f. Au
+
, Au
3+
Au
3+
< Au
+

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Periodic Table and Trends 1). Arrange the following elements in order of increasing atomic radius: Al, Na, P, Mg, K P, Al, Mg, Nam . 2). Explain the trend in atomic radius along a single period in terms of atomic structure. As the size of the nucleus increases, the nuclear = c/ ; the N/P ratio decreases. 3). Arrange the following groups of atoms in order of A). increasing size, B). Ionization Energy, C). Electron Affinity. a. Rb, Na, Be b. Sr, Se, Ne c. Fe, P, O 4). Rank each set of ions in order of decreasing size, and explain your ranking: a. Ca2+, Sr2+, Mg2+ b. K+ , S2-, Clc. Au+, Au3+ 5). In each of the following sets, which atom or ion has A). the smallest ionization energy, B). Electron Affinity? a. Cs, Ba, La b. Zn, Ga, Ge c. In, P, Ar d. Tl, Sn, As 6) . Compare the elements Na, B, Al, and C and place the elements in order of increasing atomic radius. ----------------------------- ...
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