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Atomic Number and Mass Number

The mass numb...

Question

The mass number of $X$ is 23 which contains 15 electrons. What is the atomic mass of $X$ ?

38

amu

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23

amu

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18

amu

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None of above

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Solution

The correct option is D $23$ amu
Mass no. $=$ no. of protons + no. of neutrons
Atomic mass $=$ Mass number $=$ 23

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_{11}^{23} Na

6.023 \times 10^{23}

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4.30 ˚ A

Na

23

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