Question

Isotopes of the same element always have the same

(2 points)
O atomic mass number
O A-number
O Z-number
O neutrinos

Answer 1

Z-number

Step-by-step explanation:

The Z number is the number of protons in an atom, and this does not change when an isotope is created. I got it right on the test.

Answer 2

Z number (atomic number)