Structure Of Atom Jaito Fdk

STRUCTURE OF ATOM

What is ATOM Atom is the ultimate particle of an element. FOR eg; Consider a piece of an element say gold. If we break this into smaller and smaller pieces ,it will become so small that we will not be able to see it without a microscope.

The Birth of the Modern Atomic Theory The work of British chemist John Dalton at the beginning of the 19th century revealed some of the first clues about the true nature of atoms.

STRUCTURE OF ATOM

NUCLEAR EXTRA NUCLEAR

electron

P n Extra nucleus (contains electron's)

Nucleus (contains Protons (p) neutron (n))

NUCLEAR

PROTON

NEUTRON

PROTONS • Protons carry a positive charge of +1, exactly the opposite electric charge as electrons. The number of protons in the nucleus determines the total quantity of positive charge in the atom. A proton’s mass is about 1,840 times the mass of an electron

1P +

PROTON

NEUTRONS • Neutrons are about the same size as protons but their mass is slightly greater. Without neutrons present, the repulsion among the positively charged protons would cause the nucleus to fly apart.

1P + 0n

NEUTRON

EXTRANUCLEAR

ELECTRON

ELECTRONS • Electrons are tiny, negatively charged particles that form a cloud around the nucleus of an atom. Each electron carries a single fundamental unit of negative electric charge, or –1. • The electron is one of the lightest particles with a known mass

e-

1P + 0n

ELECTRON

BIBLIOGRAPHY    

Text Book of Class 9th Encyclopedia Science Teachers(Mrs.Suman,Mrs. Babita) Computer Teachers

MA DE BY  Kamal  Raj Rani