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\mathrm{X^{2-}} has 56 electrons, the atomic number of X is :

Option: 1

56


Option: 2

58


Option: 3

28


Option: 4

54


Answers (1)

best_answer

Let number of electron in X is a

\Rightarrow a+2 = 56\Rightarrow a=54

\therefore Atomic number of X is 54.

Posted by

shivangi.bhatnagar

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