Answer :
Answer: different number of neutrons and different mass numbers
Explanation:
The statements that describe isotopes of an element are:
- Different numbers of neutrons.
- Different mass numbers.
What is an isotope?
An isotope is defined as varieties of atoms that have the same atomic number and therefore constitute the same element even though they have different mass numbers.
Characteristics of an isotope of an element
- Atoms that are isotopes of each other have the same number of protons in the nucleus.
- They are found in the same place within the periodic table.
Therefore, we can conclude that the isotopes of an element are atoms with the same atomic number but different mass numbers.
Learn more about the isotopes of an element here: https://brainly.com/question/18586743