what is isobar

Structure of atom of Class 9

ISOBARS

“Atoms of different elements which have different atomic number but same mass number are called isobars. They have different number of protons, electrons and neutron but the mass number, i.e. the sum of protons and neutrons in the nucleus is same”

Example: ,

Isobars

Protons

No. of electrons 

No. of neutrons

18

18

40–18 = 22

20

20

40–20 = 20

General Characteristics of Isobars:

  • They are atoms of different elements. 
  • They have different atomic number. 
  • They possess different physical as well as chemical properties.
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