Q. 23 C3.5( 12 Votes )

Which atoms are i

Answer :

[a] [He] 2s1

The electronic configuration of Helium is [He] 2s1 = 1s2 2s1.

Atomic number of the element = 3 [lithium, a p-block element]

[b] [Ne] 3s2 3p3

The electronic configuration of Neon is [Ne] 3s2 3p3 = 1s2 2s2 2p6 3s2 3p3.

Atomic number of the element = 15 [phosphorous, a p block element]

[c] [Ar] 4s2 3d1

The electronic configuration of Argon is given as [Ar] 4s2 3d1 = 1s2 2s2 2p6 3s2 3p6 4s2 3d1.

Atomic number of the element = 21 [scandium, a d block element]

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