Question

An isotopes has the atomic number 51 and contains 70 neutrons construct the symbol for the isotopes

Answer 1

Given,

The atomic number is Z=51

The number of the neutrons, N=70

The atom which has the atomic number 51 is the antimony.

The atomic mass number is the sum of the protons and the neutrons in the atom. Thus the atomic mass of the given element is

$\begin{gathered} A=Z+N \\ =51+70 \\ =121 \end{gathered}$

Thus the symbol of the given element is

$^{51}_{121}Sb$