Question

An isotope has the same ________, but a different ________

Answers
A) atomic number, mass number
B) Mass number, atomic number
C) number of neutrons, number of protons
D) number of protons, number of electrons

Answer 1

An isotope of an element has different number of neutrons.
Since the atomic number is based of the number of protons, it will not change.

A

Answer 2

Atomic number, mass number.

Step-by-step explanation:

The three sub atomic particles of the atoms are electron, proton and neutron. The atomic number of the element is equal to the number of protons of the element.

Isotopes may be defined as the elements that have the same atomic but different mass number. The simplest example of isotopes are protium, deuterium and tritium. They have the same atomic number 1. These are the isotopes of hydrogen.

Thus, the correct answer is option (A).