Question

Any of two or more forms of the same element which differ only in the number of neutrons their atoms contain is called an:
A. irregularity
B. isomer
C. isotope
D. irritability

Answer 1

c

Answer 2

each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei,

Answer 3

isotope

Answer 4

which they share the same electrons