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26. Rank each of the following in order of INCREASING atomic radius: f, k, Gerna. Claim: b. Evidence: c. Reasoning:
Accepted Answer
a. Claim: The atomic radii of the elements increase in the following order: F b. Evidence:
- Atomic radius generally increases down a group (column) in the periodic table. F and Ge belong to group 17 (also known as group VIIA), while K belongs to group 1 (also known as group IA).
- Atomic radius generally decreases across a period (row) in the periodic table from left to right. F is in period 2, Ge is in period 4, and K is in period 4.
- Therefore, F has the smallest atomic radius, followed by Ge, and then K has the largest atomic radius.
c. Reasoning: The trend of increasing atomic radius down a group is due to the addition of new electron shells, which increases the distance from the nucleus to the outermost electrons. The trend of decreasing atomic radius across a period is due to the increase in effective nuclear charge (the net positive charge experienced by the electrons) as more protons are added to the nucleus without a corresponding increase in the number of electron shells.
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