An ion $M^{2 +}$ contains 10 electrons and 12 neutrons. What is the atomic number and mass number of element M ?

10, 24

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10, 22

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12, 24

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12, 22

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Solution

The correct option is C 12, 24
M have
e = 12
p = 12
n = 12
so its atomic no is 12
and mass no is 24.

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

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

M^{2 +}

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