Identify each of the following:
a. ${}_1{}^1\mathrm{X}$
b. ${}_{35}{}^{81}\mathrm{X}$
c. ${}_0{}^0\mathrm{X}$
d. ${}_{26}{}^{59}\mathrm{X}$
e. ${}_{+1}{}^0\mathrm{X}$

We need to identify ${}_1{}^1\mathrm{X}$

As we know the symbol ${}_{\mathrm{Z}}{}^{\mathrm{Y}}\mathrm{X}$represents :

X= atom

Y= mass number

Z= number of proton

Therefore,

${}_1{}^1\mathrm{X}$represents ${}_1{}^1\mathrm{H}$. it is proton having $+1$ charge.

We need to identify ${}_{35}{}^{81}\mathrm{X}$

As we know the symbol represents :

X= atom

Y= mass number

Z= number of proton

Therefore,

From pereodic table we can say ${}_{35}{}^{81}\mathrm{X}$ represents ${}_{35}{}^{81}\mathrm{Br}$

We need to identify ${}_0{}^0\mathrm{X}$

As we know the symbol represents :

X= atom

Y= mass number

Z= number of proton

Therefore,

${}_0{}^0\mathrm{X}$represents ${}_0{}^0\mathrm{\gamma }$ gamma ray .

We need to identify ${}_{26}{}^{59}\mathrm{X}$

As we know the symbol represents :

X= atom

Y= mass number

Z= number of proton

Therefore, from pereodic table,

${}_{26}{}^{59}\mathrm{X}$ represents${}_{26}{}^{59}\mathrm{Fe}$

We need to identify ${}_{+1}{}^0\mathrm{X}$

As we know the symbol represents :

X= atom

Y= mass number

Z= number of proton

Therefore,

${}_{+1}{}^0\mathrm{X}$ represents positron ${}_{+1}{}^0\mathrm{e}$