Question

Hydrogen (atomic number 1) has three isotopes: ¹H, ²H, and ³H. What is the number of protons in an atom of hydrogen with the highest mass number?

(a) 2
(b) 1
(c) 0
(d) 3

Answer 1

1. Protons are what give an element the characteristics that it has. Every isotope has the same amount of protons.