The radius of atoms in the periodic table.. increases from top to bottom (down a

Question

The radius of atoms in the periodic table..
increases from top to bottom (down a column) because the effective nuclear charge increases.
decreases from left to right (across the row) because the effective nuclear charge increases.
increases from left to right (across the row) because the number of core electrons increases.
decreases from top to bottom (down a column) because the number of core electons increases.
decreases from left to right (across the row) because the effective nuclear charge decreases.

Explanation / Answer

increases from top to bottom (down a column) because the effective nuclear charge increases.

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