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Isobars and Isotopes

The sum of th...

Question

The sum of the number of electrons, protons and neutrons in the three isotopes $(^{12} C,^{13} C,^{14} C)$ of carbon is:

A

36

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B

57

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C

18

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D

39

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Solution

The correct option is B 57
Carbon has an atomic number of 6.
Isotopes of carbon are: $^{12} C,^{13} C,^{14} C$

$\begin{matrix} S y m b o l & N e u t r o n s & P r o t o n s & E l e c t r o n s^{12} C & 6 & 6 & 6^{13} C & 7 & 6 & 6^{14} C & 8 & 6 & 6 21 & 18 & 18 \end{matrix}$
$⟹ 21 + 18 + 18 = 57$

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Isobars and Isotopes

Standard XII Chemistry

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