Which atom (X) is indicated by the following configuration?
$X \to [N e] 3 s^{2} 3 p^{3}$

Nitrogen

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Chlorine

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Phosphorus

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Sulphur

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Solution

The correct option is D Phosphorus
Given electronic configuration of X: $[N e] 3 s^{2} 3 p^{3}$
where [Ne] is $1 s^{2} 2 s^{2} 2 p^{6}$
thus X is: $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{3}$
Its an element with atomic number (2+2+6+2+3)=15
It is Phosphorus (P)=X

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(i) Write the electronic configurations of the following ions: (a) H^–(b) Na⁺ (c) O^2–(d) F^–

(ii) What are the atomic numbers of elements whose outermost electrons are represented by (a) 3s¹(b) 2p³ and (c) 3p⁵?

(iii) Which atoms are indicated by the following configurations?

(a) [He] 2s¹ (b) [Ne] 3s² 3p³ (c) [Ar] 4s² 3d¹.

[N e] 3 s^{2} 3 p^{3}

3 s^{2} 3 p^{3}

{P H}_{5} ?

X

[N e] 3 s^{1}

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