The atomic number of an element having 12 neutrons and a mass number of 23 is equal to :

Z = 11

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Z = 12

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Z = 10

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Z = 13

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Solution

The correct option is C Z = 11
Mass no. = no. of protons + no. of neutrons
$23$ = no. of protons + $12$
$∴$ no. of protons = $23 - 12$
= $11$

Atomic number (Z) = no. of protons = no. of electrons = $11$

Hence, option (A) is the correct answer.

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Similar questions

12

23

An atom containing 11 protons and 12 neutrons has mass number equal to 23. . True or False

M^{2 +}

_{Z} X^{A}

| (A - 2 Z) |

(a) What is meant by (i) atomic number, and (ii) mass number, of an element? Explain with the help of an example.

(b) What is the relation between the atomic number and mass number of an element?

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