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20 April, 15:30

Nuclei with the same mass number but different atomic numbers are called isobars. Consider Ca-40, Ca-41, K-41 and Ar-41. (a) Which of these are isobars? Which are isotopes? (b) What do Ca-40 and Ca-41 have in common? (c) Correct the statement (if it is incorrect) : Atoms of Ca-41, K-41, and Ar-41 have the same number of neutrons.

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  1. 20 April, 17:22
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    Part a:

    Isobars: Ca-41, K-41 and Ar-41

    Part b:

    Number of proton

    Part c:

    Incorrect statement

    Explanation:

    Part a:

    Nuclei with same mass number are called isobars.

    Given:

    Ca-40, Ca-41, K-41 and Ar-41

    Ca-41, K-41 and Ar-41 have equal mass numbers, so these are isobars.

    Part b:

    Atomic number of Ca = 20

    Atomic no. = Number of proton.

    So, Ca-40 ans C-41 have same number of proton or in other words proton count is common in both.

    Part c:

    Number of neutrons in Ca-41

    Atomic number = 20

    Mass number = 41

    Number of neutron = Mass number - atomic number

    = 41 - 20 = 21

    Number of neutrons in K-41

    Atomic number = 19

    Mass number = 41

    Number of neutron = Mass number - atomic number

    = 41 - 19 = 22

    Number of neutrons in Ar-41

    Atomic number = 18

    Mass number = 41

    Number of neutron = Mass number - atomic number

    = 41 - 18 = 23

    So, the statement is incorrect.
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