Question

Select the correct definition of isotopes ( 2.5 points) (A) Two atoms of the same element having different number of neutrons 10 Two atoms of the same element having same atomic number but different mass number (C) Both (A) and (B) (D) None of the above.

Answer 1

Isotopes are atoms of the same element with the same atomic number but different mass numbers due to variations in the number of neutrons, making option (C) the correct choice.

Step-by-step explanation:

The correct definition of isotopes is that they are atoms of the same element that have the same number of protons, and hence the same atomic number, but a different number of neutrons, leading to a different mass number. This means that both option (A) Two atoms of the same element having different number of neutrons, and option (B) Two atoms of the same element having same atomic number but different mass number, are correct. Therefore, the answer is (C) Both (A) and (B).

Answer 2

C

Step-by-step explanation:

(A) is correct. Isotopes are the same element that only differ in number of neutrons.

(B) is also correct. Atomic number (z) is the number of protons an atom has. Atoms of the same element will have the same number of protons.

Mass number (A) is the sum of protons and neutrons in the center. If protons between two atoms are the same but mass number is not, means they have different number of neutrons. They are isotopes.

(C) States that both A and B are correct

(D) None of the above

Option C is correct