
(a)
Interpretation:
The element with the smallest atomic radius needs to be determined using the trends in the periodic table.
Concept Introduction:
An atomic radius is calculated by taking the distance between two adjacent atoms of the same element and divided by 2 in a molecule.
(a)

Answer to Problem 69A
Fluorine (F) has the smallest atomic radius.
Explanation of Solution
The atomic radius of atoms increases when we go from top to bottom in a group.
Fluorine is the element of the 17th group. It is the first member and radius increase when we move downwards. So, the size of fluorine is the smallest.
(b)
Interpretation:
The element with the smallest atomic radius needs to be determined using the trends in the periodic table.
Concept Introduction:
An atomic radius can be defined as half the distance between two adjacent atoms of the same element in a molecule.
(b)

Answer to Problem 69A
Xenon (Xe) has the smallest atomic radius.
Explanation of Solution
As we move along a period, nuclear charge increases and the size of the atoms decreases.
Since Xe is extreme right in period 5 and it has the smallest atomic radius.
(c)
Interpretation:
The element with the smallest atomic radius needs to be determined using the trends in the periodic table.
Concept Introduction:
An atomic radius can be defined as half the distance between two adjacent atoms of the same element in a molecule.
(c)

Answer to Problem 69A
Neon (Ne) has the smallest atomic radius.
Explanation of Solution
The atomic radius of atoms increases when we move from top to bottom within a group.
Neon is the element of the 18th group. The radius increases when we move downwards. So, the size of neon is the smallest.
Chapter 11 Solutions
World of Chemistry
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