A pair of isobars will always have different number of protons, electrons and neutrons in them.Do you agree?.Explain.

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Solution

Isobars are atoms of different chemical elements with the same mass number.
Mass number is the sum of the number of protons and neutrons.
Different chemical elements will have different atomic numbers/numbers of protons.
For any neutral element number of electrons will be also equal to the atomic number.
Thus a pair of isobars will always have a different number of protons, electrons and neutrons in them.
eg; ${}_{7}^{14}N$ and ${}_{6}^{14}C$ are isobars

${}_{7}^{14}N$ ${}_{6}^{14}C$
number of (protons and electrons) 7 6
number of neutrons 7 8

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Question 07

Two atoms are said to be isobars if ?

(a) They have same atomic number but different mass number

(b) They have same number of electrons but different number of neutrons

(d) Sum of the number of protons and neutrons is same but the number of protons is different

(a) an atom has equal number of electrons and protons

(b) an atom has equal number of electrons and neutrons

(d) an atom has equal number of electrons, protons and neutrons

Which of the following statement is correct about the atom of an element ?

(a) an atom can have only protons and neutrons but no electrons.

(b) an atom can have only electrons and neutrons but no protons

(d) an atom must always have a proton, neutron and electron

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	${}_{7}^{14}N$	${}_{6}^{14}C$
number of (protons and electrons)	7	6
number of neutrons	7	8