The number of protons, electrons and neutrons in a species are equal to 17,18 and 18 respectively. Which of…
The number of protons, electrons and neutrons in a species are equal to 17,18 and 18 respectively. Which of the following will be the proper symbol of this species?
\({ }_{17}^{35} \mathrm{Cl}\)
\({ }_{17}^{35} \mathrm{Cl}^{-}\)
\({ }_{17}^{36} \mathrm{Cl}\)
\({ }_{17}^{36} \mathrm{Cl}^{-}\)
Solution
\(p=17, e=18, n=18\)
means, \(Z=17 \Rightarrow\) element is chlorine, which contains one electron more \((17+1)\), so it is chloride ion, \(\mathrm{Cl}^{-}\).
\(\Rightarrow\) Symbol: \({ }_{17}^{35} \mathrm{Cl}^{-}\);
Mass number, \(A=n+p=18+17=35\)
Atomic number, \(Z=17\)