An atom that has an atomic number of 38 and a mass number of 88 is an isotope of an atom that has
A) an atomic number of 39 and a mass number of 88.
B) an atomic number of 38 and a mass number of 86.
C) 50 neutrons and 38 protons.
D) 50 protons and 38 neutrons.

Question

Quizplus · Accepted Answer

Isotopes have the same atomic number but different mass numbers. An atom with atomic number 38 and mass number 88 has 38 protons and 50 neutrons. An isotope would have the same atomic number (38) but a different mass number, such as 86.

An Atom That Has an Atomic Number of 38 and a Mass