Radioactive emissions

Easy

Oxygen-16 is an isotope of oxygen. Oxygen-16 contains 8 protons and 8 neutrons. Which atom $Y\text{Y}$ is also an isotope of oxygen?

$715Y^{15}_{7}\text{Y}$

$716Y^{16}_{7}\text{Y}$

$817Y^{17}_{8}\text{Y}$

$918Y^{18}_{9}\text{Y}$

Radioactive emissions Questions