Why did early scientists use atomic mass and not atomic number?

1 Answer
Jun 6, 2018

Answer:

The neutron and protons had not been discovered yet. Atomic number is based on protons.

Explanation:

Atomic mass could be measured and was a known quantity.
Atomic number is based on the number of protons. The number of protons could not yet be measured.

Early scientists could only used atomic mass.