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Formation of Ions in Metals

The atomic nu...

Question

The atomic number of the atom which becomes stable by gaining 3 electrons in 5th shell is :

A

56

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B

49

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C

51

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D

54

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Solution

The correct option is D 51
The element Sb with atomic number 51, has electronic configuration 2, 8, 18, 18, 5.. Thus with addition of 3 electrons the outer valence shell will complete its octet hence becomes stable.

Hence, the correct option is $C$

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Formation of Ions in Metals

Standard VIII Chemistry

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