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Structure of atom

Atoms Molecules Ions Chemical Equations On-line practice

 

 

Atoms are made up of protons, electrons and neutrons.

Particle Relative Mass Relative Electric Charge
Proton

Neutron

Electron

1

1

neg.

+1

0

-1

 

bulletAlmost all the mass of an atom is contained in its nucleus because the electrons have a very tiny mass compared to the protons and neutrons.
bulletAtoms of different elements have different number of protons, electrons and neutrons.

Example :
Element No. of electrons No. of protons No. of neutrons  Structure
 

 

Sodium

 

 

11 11 12
 

 

Oxygen

 

 

8 8 8

 

What are atoms made of ] [ Structure of atom ] Representing atoms ] Electron arrangement in atom ] Isotopes ]