What is the distribution of electrons in a magnesium atom?

(2, 8, 1)

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(2, 8, 2)

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(2, 8, 3)

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(2, 8, 4)

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Solution

The correct option is B (2, 8, 2)
The total number of electrons present in Magnesium atom is 12.
The distribution of electrons in magnesium atom is given by:
First orbit or K shell $= 2 (2 n^{2} = 2 \times 1^{1} = 2)$
Second orbit or L shell $= 8 (2 \times 2^{2} = 8)$
Third orbit or M shell $= 2 (12 - 2 - 8 = 2)$

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Similar questions

p

12.58

$x$ :	$5$	$8$	$10$	$12$	$p$	$20$	$25$
$f$ :	$2$	$5$	$8$	$22$	$7$	$4$	$2$

Variable	$4$	$8$	$9$	$10$	$11$	$12$	$13$
Frequency	$3$	$4$	$5$	$8$	$4$	$3$	$2$

Name of letters	Number of surnames
2 $-$ 4 4 $-$ 6 6 $-$ 8 8 $-$ 10 10 $-$ 12 12 $-$ 14	9 22 38 19 8 4

Find the missing value of $p$ for the following distribution whose mean is 12.58.

$\begin{matrix} x : & 5 & 8 & 10 & 12 & p & 20 & 25 f : & 2 & 5 & 8 & 22 & 7 & 4 & 2 \end{matrix}$

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