Electronic configuration of four elements is given below. Which of the following does not belong to the same group?

[K r] 4 d^{10} 5 s^{2}

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[A r] 3 d^{10} 4 s^{2}

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[X e] 5 p^{6} 6 s^{2}

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[X e] 4 f^{14} 5 d^{10} 6 s^{2}

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Solution

The correct option is C $[X e] 5 p^{6} 6 s^{2}$
The element with electronic configuration $[X e] 6 s^{2}$ is Ba, an alkaline earth metal. It belongs to group IIA. Other elements ( $Z n, C d$ and $H g$ ) are transition metals and belong to group 12 (II B).

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(i) [X e] {6 s}^{1}

(i i) [X e] {4 f}^{14}, {5 d}^{1} {6 s}^{2}

(i i i) [A r] {4 s}^{2} {4 p}^{3}

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n s^{2}

The electronic configuration of three elements X, Y and Z are given below:

X: 2

Y: 2, 6

Z: 2, 8, 2

i. Which element belongs to the second period?

ii. Which element belongs to the second group?

There are four elements P, Q, R and S with their electronic configuration given in the options. Which of these elements belong to the same group?

M^{3 +}

[A r] 3 d^{10} 4 s^{2}

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