Which atoms are indicated by the following configurations?
(a) [He] 2s¹ (b) [Ne] 3s² 3p³ (c) [Ar] 4s² 3d¹.

Question

Which atoms are indicated by the following configurations? (a) [He] 2 s 1 (b) [Ne] 3 s 2 3 p 3 (c) [Ar] 4 s 2 3 d 1 .

Philoid · Accepted 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]

Which atoms are indicated by the following configurations?(a) [He] 2s1 (b) [Ne] 3s2 3p3 (c) [Ar] 4s2 3d1.