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An ion is an atom with a net electric charge due to the loss or gain of one or more electrons.
An isotopeis each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei, and hence differ in relative atomic mass but not in chemical properties.
Answer:Calcium atoms have smaller radii than potassium atoms since calcium atoms have a greater nuclear charge.
Explanation:
Because it has more protons than electrons. Protons are positive so if there is more of them than electrons, the ion will have a positive charge.
