Question

- Write the electronic configuration of the following elements :
(i) Silicon (Z = 14)
(i) Chlorine (Z = 17) (i) Chromium (Z = 24)​

Answer 1

Explanation:

(1) 1s2 2s2 2p6 3s2 3p2 - silicon

(2) 1s2 2s2 2p6 3s2 3p5 -chlorine

(3) 1s2 2s2 2p6 3s2 3p6 4s2 3d4 - chromium

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Answer 2

(i) Electronic Configuration of Silicon (Si) = 1s²2s²2p⁶3s²3p²

(ii) Electronic Configuration of Chlorine (Cl) = 1s²2s²2p⁶3s²3p⁵

(iii) Electronic Configuration of Chromium (Cr) = 1s²2s²2p⁶3s²3p⁶4s¹3d⁵

Let us see why we need electronic configuration -

• For determining the valency of an element.

• To predict the properties of a group of elements.
• To know whether an atom or ion is stable or not.