Chapter : 4. Structure Of Atoms
Isobars
(B) Isobars
Isobars are the atoms of different elements having same mass number but different atomic numbers.
Since isobars have the same mass number, therefore sum of the protons and neutrons in the nucleus of each is the same. These atoms differ in their atomic number and therefore, they have different number of protons and also different number of neutrons. Due to different atomic numbers, the isobars will have different atomic structures and therefore, will differ in chemical properties.
Example. Argon (atomic number 18) and calcium (atomic number 20) are isobars because they have same mass number 40.
Argon
Calcium 
At. no. = 18, At. no. = 20,
Mass no. = 40 Mass no. = 40
No. of electrons = 18 No. of electrons = 20
No. of protons = 18 No. of protons = 20
No. of neutrons = 22 No. of neutrons = 20
Isobars are the atoms of different elements having same mass number but different atomic numbers.
Since isobars have the same mass number, therefore sum of the protons and neutrons in the nucleus of each is the same. These atoms differ in their atomic number and therefore, they have different number of protons and also different number of neutrons. Due to different atomic numbers, the isobars will have different atomic structures and therefore, will differ in chemical properties.
Example. Argon (atomic number 18) and calcium (atomic number 20) are isobars because they have same mass number 40.
Argon
Calcium At. no. = 18, At. no. = 20,
Mass no. = 40 Mass no. = 40
No. of electrons = 18 No. of electrons = 20
No. of protons = 18 No. of protons = 20
No. of neutrons = 22 No. of neutrons = 20
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