Atoms of different elements have a different mass and volume. Why is the statement true?

A. Atoms lack the same number of electrons.

B. Atoms have protons, neutrons, and electrons.

C. Atoms have unique properties that define them.

D. Atoms of all elements have a spherical shape.

American scientist, linus pauling, was one of many scientists racing to discover the molecular structure of dna. pauling initially thought that the molecule was a triple helix. later, james watson and francis crick unveiled their double helix model, which turned out to be an accurate description of the molecule's shape. why did watson and crick succeed when pauling failed?