An ion $X^{2 +}$ contains 18 electrons and 20 neutrons. Calculate the atomic number and mass no. of element X. Name the element X.

Atomic no -18, Mass no - 40, Argon

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Atomic no - 22, Mass no - 48, Titanium

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Atomic no - 20, Mass no - 40, Calcium

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None of the above

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Solution

The correct option is C
Atomic no - 20, Mass no - 40, Calcium

Originally, the no. of electrons = 18+2 = 20

Thus, no. of protons = 20

Mass number = no. of protons + no. of neutrons.

Mass number = 20 + 20 = 40

The name of the element is Calcium

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Similar questions

An ion X²⁺ contains 18 electrons and 20 neutrons. Calculate the atomic number and mass no. of element X. Name the element X.

_{Z} X^{A}

Z = 18 A = 40

A = 9

Z =

A =

How to remember atomic no and mass no of elements?

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