Q and R are elements in the same period of the Periodic Table.
Q has 7 electrons in its outer shell and R has 2 electrons in its outer shell.
Which statement about Q and R is correct?
1 )
Q is a metal and R is a non-metal.
2 )
Q and R have different numbers of electron shells.
3 )
R is found to the right of Q in the Periodic Table.
The proton number of R is less than the proton number of Q.
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