Question

Which of the following configuration is correct for iron ?
(a) 1s²,2s²2p⁶,3s²3p⁶3d⁴
(b) 1s²,2s²2p⁶,3s²3p⁶3d⁶4s²
(c) 1s²,2s²2p⁶,3s²3p⁶3d²
(d) 1s²,2s²2p⁶,3s²3p⁶3d²4s²

Answer 1

The electronic configuration of iron is 1s²,2s²2p⁶,3s²3p⁶3d⁶4s².

Option (B) is correct.

Explanation:

• It is a chemical element with symbol Fe.
• The atomic number of iron = 26.
• Its mass number is 55.845 u and atomic number is 26.
• By mass , it is the most common element of earth's surface.
• It has 2, 8, 14, 2 number of electrons per shell. Therefore, the electronic configuration of iron is 1s²,2s²2p⁶,3s²3p⁶3d⁶4s².
• The shortest electronic configuration is [Ar] 3d⁶4s².

Hence the electronic configuration of iron is 1s²,2s²2p⁶,3s²3p⁶3d⁶4s².

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