Question

Write the complete symbol for the atom with the given atomic number $\left(\mathrm{Z}\right)$ and mass number $\left(\mathrm{A}\right)$.

(a) $\mathrm{Z}=17$, $\mathrm{A}=35$

Answer 1

Given:

Atomic number, $\mathrm{Z}=17$

Mass number, $\mathrm{A}=35$

Formula used:

Representation of atom$={}_{\mathrm{Z}}{}^{\mathrm{A}}\mathrm{X}$

Here, $\mathrm{X}$ is the chemical symbol of the element, $\mathrm{Z}$ is the atomic number and $\mathrm{A}$ is the mass number.

Determine the chemical symbol:

The atomic number is $17$.

The element having atomic number $17$ is Chlorine.

Thus, chemical symbol for Chlorine is $\mathrm{Cl}$.

Write the symbol for the atom:

The general representation of the symbol of an element is ${}_{\mathrm{Z}}{}^{\mathrm{A}}\mathrm{X}$.

Substitute $\mathrm{Cl}$ for the chemical symbol, $17$ for the atomic number and $35$ for the mass number.

Thus, the complete symbol for the atom is ${}_{17}{}^{35}\mathrm{Cl}$.

Thus, the complete symbol for the atom with the atomic number $17$ and mass number $35$ is ${}_{\mathbf{17}}{}^{\mathbf{35}}\mathbf{Cl}$.