Question

The atom of an element X has 12 neutrons in its nucleus.If 11 electrons revolve around its nucleus

(i)

The electronic configuration of X and determine its valency.

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Answer 1

Answer:

Mass number of X = Protons + Neutrons

= 6 + 6

= 12

Mass number of Y = Protons + Neutrons

= 6 + 8 = 14

As the atomic number is same i.e., = 6

[atomic number = number of protons].

Both X and Y are isotopes of same element.

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