Question

what is an atom,atomic mass and atomic number​

Answer 1

Answer:

atom is smallest particle which cannot be divided further

Atomic mass is mass of atom as hydrogen has atomic mass 1u

Atomic number is no.of electron present in an atom as copper Atomic Mass is 24u but it's atomic number is 12

Answer 2

Answer:

hello mate ☺

The mass number (symbol A, from the German word Atomgewicht (atomic weight), also called atomic mass number or nucleon number, is the total number of protons and neutrons (together known as nucleons) in an atomic nucleus. ... The mass number is different for each different isotope of a chemical element.