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30 August, 13:02

How many neutrons and protons are there in the nuclei of the following atoms. a. Li-7 b. O-16 c. Th-232 d. Pu-239

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  1. 30 August, 13:23
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    a.

    P = 3, N = 4

    b.

    P = 8, N = 8

    c.

    P = 90, N = 142

    d.

    P = 94, N = 145

    Explanation:

    Mass number = Number of protons + Number of neutrons

    Also,

    Atomic number = Number of protons

    Li - 7

    Given, Mass number of Lithium = 7

    For lithium, atomic number = 3

    So,

    Number of protons = 3

    Number of neutrons = Mass number - Number of protons = 7 - 3 = 4

    O - 16

    Given, Mass number of oxygen = 16

    For oxygen, atomic number = 8

    So,

    Number of protons = 8

    Number of neutrons = Mass number - Number of protons = 16 - 8 = 8

    Th - 232

    Given, Mass number of Thorium = 232

    For Thorium, atomic number = 90

    So,

    Number of protons = 90

    Number of neutrons = Mass number - Number of protons = 232 - 90 = 142

    Pu - 239

    Given, Mass number of Plutonium = 239

    For Plutonium, atomic number = 94

    So,

    Number of protons = 94

    Number of neutrons = Mass number - Number of protons = 239 - 94 = 145
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