Answer
The $6p$ subhsell has the greater number of electrons.
Work Step by Step
The $s$ subshell can hold up to 2 electrons. If the $s$ subshell is closed, then it holds 2 electrons.
The $p$ subshell can hold up to 6 electrons. If the $p$ subshell is closed, then it holds 6 electrons.
If the $6p$ subshell is closed, then it holds 6 electrons.
If the $7s$ subshell is closed, then it holds 2 electrons.
The $6p$ subhsell has the greater number of electrons.
