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

{}_{6}^{13}C:

Mass number of carbon-13 = 13

Atomic number of carbon = Number of protons in one carbon atom = 6

Therfore, total number of neutrons in 1 carbon atom = Mass number – Atomic number = 13 – 6 = 7

{}_{8}^{16}O

Mass number of oxygen-16 = 16

Atomic number of oxygen  = 8

Hence, No. neutrons = Mass number – Atomic number = 16 – 8 = 8

{}_{12}^{24}Mg

Mass number = 24

Atomic number = 12

No. neutrons = Mass number – Atomic number = 24 – 12 = 12

{}_{26}^{56}Fe

 

Mass nubmer = 56

Atomic number of iron = No. protons in iron= 26

No. neutrons = Mass number – Atomic number = 56 – 26 = 30

{}_{38}^{88}Sr

Mass number = 88

Atomic number =  38

No. neutrons = Mass number – Atomic number = 88 – 38 = 50