atomic number of Na -11
electronic configuration of Na - 2,8,1
outermost shell of Na has one electron. To become stable and to have a complete octet in the outermost shell, it loses that electron in the outermost shell and becomes positively charged.
Then electronic configuration is 2,8 with 10 electrons . Noble gas with atomic number 10 is Neon.Therefore it will have the same number of valence electrons as B) Neon
