Atomic number and Atomic weight

Atomic number noun - The order of an element in Mendeleyev's table of the elements; equal to the number of protons in the nucleus or electrons in the neutral state of an atom of an element.

Atomic weight and atomic number are semantically related in protons and neutrons topic. In some cases you can use "Atomic weight" instead a noun phrase "Atomic number".

Atomic weight noun - (chemistry) the mass of an atom of a chemical element expressed in atomic mass units.

Atomic number and atomic weight are semantically related in protons and neutrons topic. You can use "Atomic number" instead a noun phrase "Atomic weight".