Question

How do you represent the following atom ?

Fluorine

Answer 1

General representation of an atom of element:

1. The general representation of an atom of an element is ${}_{\mathrm{Z}}{}^{\mathrm{A}}\mathrm{X}$.
2. Here, $\mathrm{X}$ is the chemical symbol of element, $\mathrm{Z}$ is atomic number and $\mathrm{A}$ is mass number.

Representation of Fluorine atom:

1. The chemical symbol for Fluorine is $\mathrm{F}$. Thus, $\mathrm{X}=\mathrm{F}$.
2. The atomic number of Fluorine is $9$. Thus, $\mathrm{Z}=9$.
3. The mass number of Fluorine is $19$. Thus, $\mathrm{A}=19$.

Thus, Fluorine atom is represented as ${}_9{}^{19}\mathrm{F}$.