How many neutrons and protons are there in the following nuclei?
$_{6}^{13} C,_{8}^{16} O, 12^{24} M g,_{26}^{56} F e,_{38}^{88} S r$

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Solution

The number of neutrons and protons are shown below.
Nucleus Atomic number, Z
Mass number, A
Number of protons $=$ atomic number
Number of neutrons $= A - Z$
$_{6}^{13} C$
6 13 6 $13 - 6 = 7$
$_{8}^{16} O$
8 16 8 $16 - 8 = 8$
$_{12}^{24} M g$ 12 24 12 $24 - 12 = 12$
$_{26}^{56} F e$ 26 56 26 $56 - 26 = 30$
$_{38}^{88} S r$ 38 88 38 $88 - 38 = 50$

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_{6}^{13} C,_{8}^{16} O,_{12}^{24} M g,_{26}^{56} F e a n d_{33}^{88} S r

How many neutrons and protons are there in the following nuclei?
$_{6}^{13} C,_{8}^{16} O,_{12}^{24} Mg,_{26}^{56} Fe,_{38}^{88} Sr$

_{12}^{25} M g

{F e}^{56}

16

_{8} O^{16}

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Nucleus	Atomic number, Z	Mass number, A	Number of protons $=$ atomic number	Number of neutrons $= A - Z$
$_{6}^{13} C$	6	13	6	$13 - 6 = 7$
$_{8}^{16} O$	8	16	8	$16 - 8 = 8$
$_{12}^{24} M g$	12	24	12	$24 - 12 = 12$
$_{26}^{56} F e$	26	56	26	$56 - 26 = 30$
$_{38}^{88} S r$	38	88	38	$88 - 38 = 50$