Answer :
Since neon has 8 valence electrons, a full octet makes neon stable. It is also a noble gas. Then, you do the configuration...
1s2 2s2 2p6
2s holds 2 valence electrons while 2p has 6 that equals a full octet.
1s2 2s2 2p6
2s holds 2 valence electrons while 2p has 6 that equals a full octet.