The members of a family of an element that all have the same number of protons but different numbers of neutrons are called:
Show answer & explanation
Correct answer: A
Explanation
The correct answer is Option 1 i.e. isotopes.
The members of a family of elements that all have the same number of protons (and therefore the same atomic number) but different numbers of neutrons are called "isotopes."
Isotopes of an element have similar chemical properties because they have the same number of protons, which determines the element's chemical identity.
However, they may have different atomic masses due to the varying number of neutrons, which makes them behave slightly differently in nuclear reactions and have different physical properties like atomic mass and stability.