X and Y are atoms of different elements in Period 3 of the Periodic Table. Neither X nor Y is argon.
X is a non-metal.
X has a greater atomic radius than Y.
Which statement is correct?
1 )
X has more occupied electron shells than Y.
2 )
X has more protons in each atom than Y.
3 )
X has the same number of outer electrons in each atom as Y.
Y is a non-metal.
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