Question

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

Answer 1

$_{6}^{13}\textrm{C}$: Atomic mass = 13
Atomic number = Number of protons = 6
Number of neutrons = (Atomic mass)(Atomic number) = 136 = 7
$_{8}^{16}\textrm{O}$: Atomic mass = 16
Atomic number = 8 Number of protons = 8
Number of neutrons = (Atomic mass)(Atomic number) = 168 = 8
$_{12}^{24}\textrm{Mg}$ : Atomic mass = 24
Atomic number = Number of protons = 12
Number of neutrons = (Atomic mass) (Atomic number) = 2412 = 12
$_{26}^{56}\textrm{Fe}$ : Atomic mass = 56
Atomic number = Number of protons = 26
Number of neutrons = (Atomic mass)(Atomic number) = 5626 = 30
$_{38}^{88}\textrm{Sr}$ : Atomic mass = 88
Atomic number = Number of protons = 38
Number of neutrons = (Atomic mass)(Atomic number) = 88 38 = 50