Atoms and molecules (very very important🧠🧠🚗🚗🚗)

 ,Atoms

 the building block of all matter are atoms

Atoms are very small they are smaller than anything that we can imagine or compared with

Atomic radius is measured in Nanometers

Molecules

 molecules is in  general a group of two or more atoms that are chemically bonded together, that is, tightly held together by attractive forces

Atoms of the same element or of different elements can join together to form molecules 

Atomicity

The number of atoms constituting a molecule is known as atomicity

OR

Number of atoms in a molecule

Monoatomic = number of atom is one

Diatomic state = Number of atomic is two

 Triatomic state = Number of atom is three 

Isobars = Atoms of different elements with same atomic mass

Iso=same             Baros=weight

Total nucleon=proton+neutron=atomic Mass

Isotope = same number of protons but different number of neutrons

Atomic mass = total number of proton and neutron