Question

The carbon atom is sometimes listed as carbon-12 and sometimes as carbon-14. What does this mean?

A.
These are two isotopes of the carbon atom. Carbon-12 has 6 neutrons and carbon-14 has 8 neutrons.

B.
These are two isotopes of the carbon atom. Carbon-12 has 6 protons and carbon-14 has 8 protons.

C.
These are two allotropes of the carbon atom. Carbon-12 has 6 neutrons and carbon-14 has 8 neutrons.

D.
These are two allotropes of the carbon atom. Carbon-12 has 6 protons and carbon-14 has 8 protons.

Answer 1

I think A.

Answer 2

Thanks!