Question

which of the following pairs are isotopes ?
a.)
$\frac{209}{84} x \frac{210}{84} x$
b.)
$\frac{40}{18} x \frac{40}{19} x$​

Answer 1

Answer:

A

Explanation:

All isotopes of a given element have the same number of protons and electrons but different numbers of neutrons in each atom.