Question

hydrogen has three isotopes ^1h, ^2h, and ^3h. what is the difference between these three isotopes?
the number of protons ranges from 1 to 3.
the number of electrons ranges from 1 to 3.
the number of neutrons ranges from 0 to 2.
the number of protons ranges from 0 to 2.

Explanation:

同位素是具有相同质子数，不同中子数的同一元素的不同核素。氢的三种同位素$^1H$、$^2H$、$^3H$质子数均为1，电子数也均为1，中子数分别为0、1、2。

Answer:

The number of neutrons ranges from 0 to 2.