Question

which of the following is an isotope of the atom shown above?

options: w, x, y, z (with corresponding atomic models)

choices: a. w b. x c. y d. z

Explanation:

Isotopes of an element have the same number of protons (atomic number) but different numbers of neutrons (mass number). The original atom has 6 protons and 6 neutrons. Option Y has 6 protons and 8 neutrons, matching the isotope definition. Other options differ in proton count (X has 7 protons) or neutron count equal to the original (W has 6 neutrons, Z has 6 neutrons). Thus, Y is the isotope.

Answer:

A. Y