Atoms and Molecules

Atoms

which are the smallest particle of an element that can exist

sub-atomic particles

proton

Relative Mass: 1

Relative Charge: +1

Location: nucleus

neutron

Relative Mass: 1

Relative Charge: 0

Location: nucleus

electron

Relative mass: 1/1840

Relative Charge: -1

Location: around the nucleus

number of protons = number of electrons

Mass of an atom is mainly contibuted by proton and neutrons in the nucleus

mass of electrons in a atom are negligible

Molecules

are two or more atoms from the same or different elements combined together