Question

what is atom, atomic no., atomic mass.​

Answer 1

Answer:

an atom is the smallest particle of the molecules

the total number of electron or proten present  a atom is called atomic numbaer while the sum of neutron and proten is called atomic mass

Explanation:

Answer 2

Answer:

1. Atom is the small particle of matter(length is about 10^-10m) which consists of electrons,protons and neutrons.
2. Atomic number is the number of protons in an atom
3. Atomic mass is the mass of atom(protons, neutrons and electrons)but electrons are not considered as they have a negligible mass.