This is obviously the Nobel gas argon.
If this is the configuration of a NEUTRAL atom (not a molecule that is) then it is atom number 24 Chromium (transition metal: group 6, period IV)
neon
1s2 2s2 2p6 3s2 3p6 4s2 3d3
Silicon.
1s2 2s2 2p6
1s2, 2s2 2p6, 3s2 3p1or[Ne], 3s2 3p1
Argon
The electron configuration of chlorine is 1s2 2s2 2p6 3s2 3p5
2, 6 or 1s2, 2s2, 2p6
Normal Ca atom electron configuration: 1s2 2s2 2p6 3s2 3p6 4s2Ca+ (last electron is gone from the s orbital): 1s2 2s2 2p6 3s2 3p6 4s1
1s2 2s2 2p6 3s1 3p1
1s2 2s2 2p6 3s2 3p6
The investigator will find that 1s2 2s2 2p6 is the electron configuration for neon.
2-7-8
Zinc's complete electron configuration is 1s22s22p63s23p64s23d10
5
1s2 2s2 2p6 3s2 3p6 is the electron configuration of chlorine
It would be 1s2 2s2 2p6 3s2 3p6 3d5 4s1.
1s2 2s2 2p6 3s2 3p6 4s1