[He] 2s one
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The abbreviated electron configuration for argon is [Ne] 3s^2 3p^6. The [Ne] represents the electron configuration of the noble gas neon, which has the same electron configuration as the inner electrons of argon.
The element with the electron configuration 1s2 2s1 is lithium.
The abbreviated electron configuration of oxygen is [He] 2s^2 2p^4.
The abbreviated electron configuration of cobalt is [Ar] 3d7 4s2.
The abbreviated electron configuration for Francium (Fr) is [Rn] 7s1.