Question

q.9. an atom has 23 protons and 24 neutrons. which of the following is an isotope of this element? a) protons = 22, mass number = 47 b) protons = 23, mass number = 47 c) protons = 22, mass number = 52 d) protons = 23, mass number = 52

Explanation:

Step1: Recall isotope definition

Isotopes have same number of protons but different number of neutrons. Given atom has 23 protons.

Step2: Analyze each option

• Option a: Has 22 protons, not an isotope.
• Option b: Has 23 protons. Mass number = protons + neutrons. Neutrons = 47 - 23=24, same as given atom, not an isotope.
• Option c: Has 22 protons, not an isotope.
• Option d: Has 23 protons. Mass number = 52, neutrons = 52 - 23 = 29, different from given atom's 24 neutrons, so it is an isotope.

Answer:

d) Protons= 23, mass number= 52