Question

how are isotopes defined? forms of different elements that have the same number of neutrons in each atom forms of the same element that differ in the number of neutrons in each atom forms of different elements that have the same number of protons in each atom forms of the same element that differ in the number of protons in each atom

Explanation:

Los isótopos son átomos del mismo elemento químico que tienen el mismo número de protones (lo que define el elemento), pero un número diferente de neutrones. Esto les da diferentes masas atómicas.

Answer:

forms of the same element that differ in the number of neutrons in each atom