Write the electronic configuration of a positively charged sodium ion (Na+). (Atomic number is 11)
a) 1s² 2s² 2p⁶ 3s¹
b) 1s² 2s² 2p⁶
c) 1s² 2s² 2p⁶ 3s²
d) 1s² 2s² 2p⁶ 3s² 3p¹