Question

What do all atoms of the same element have in common
a
number of neutrons
b
size of nucleus
c
total mass
d
number of protons

Answer 1

All atoms of the same element have in common **d) number of protons**. The number of protons in the nucleus of an atom determines the element's identity. For example, all hydrogen atoms have one proton, and all oxygen atoms have eight protons. The number of neutrons and total mass can vary among different isotopes of an element, and the size of the nucleus can vary as well.