Question

What is the number at the end of an isotope’s name?

Answer 1

Explanation:

5 I don't know what is the answer if I got it wrong

Answer 2

Answer:

The number of protons and electrons remain same for two isotopes. This means isotopes have different mass number but have same atomic number. When we write an isotope, the number at the end of the isotope's name is the mass number.