Question: (a) Among the nonmetallic elements, the change in atomic radius in moving one place left or right in a row is smaller than the change

(a) Among the nonmetallic elements, the change in atomic radius in moving one place left or right in a row is smaller than the change in moving one row up or down. Explain these observations.
(b) Arrange the following atoms in order of increasing atomic radius: Si, Al, Ge, Ga.

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