The word isotopes describes elements that have
A)the same atomic number but different atomic mass.
B)the same atomic mass but different atomic number.
C)the same atomic mass and the same atomic number but different chemical properties.
D)similar chemical properties,though they differ in both atomic mass and atomic number.
E)the same number of valence electrons.

Question

Quizplus · Accepted Answer

Isotopes are defined as elements with the same number of protons (atomic number) but different number of neutrons (atomic mass).

The Word Isotopes Describes Elements That Have