Structure Of Atom

STRUCTURE OF ATOM

ATOM 

Atom is the smallest poatical of atom an element which posses all the properties of that element.

STRUCTURE OF ATOM Atom has two main parts Nucleus Extra – Nucleus

Nucleus The central part of atom is called nucleus .It has two particle proton and neutron.

Proton : It is positiuely charged partical having charge 1.602*10-19coulombs. The mass of protons is 1.673*10-24 g.

Neutron : It is neutral partical having no charge and mass is 1.675*10-24 g.

Extra Nucleus Part: In this part only one poitical known as electron is revolving in orbits.

Electron: electron is a negatively charged partical having charge 1.602*10-19 c and mass is 9.1*10-28 g.

INVONTOR OF ELECTION J.J.JHOMSON AND JAMES CHADWICK ALSO HAS INVENTED ELECTRON.

ATOMIC NUMBER : The number of protons in the neclus and the number of electrons in the extra neculus part is called atomic number it is denoted by z. The no of protons = no of electrons.

THE ATOMIC MASS : The sum of protons or electrons and the neutrons is called atomic mass. It is denoted by A. Atomic no = no of protons or no of electrons + no of neutrons. Exp. In atom of sodium there are 11 protons and 11 electron and 12 neutrons. Hence atom no of 11 and atom mass is equal to 11+12=23.

By (Class 9th) Veerpal kaur Karmveer kaur Kuljeet Singh Sukhpreet Kaur Jaspreet Kaur Guided By S.Balwinder Singh (Sci.Master) G.H.School Jiwan Wala(FDK)