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19 February, 21:49

Be sure to answer all parts. Indicate the number of protons, neutrons and electrons in each of these species: (a) 13 N 7 (b) 35 S 16 (c) 63 Cu 29 (d) 89 Sr 38 How many protons are in each isotope? How many neutrons are in each isotope? How many electrons are in each isotope?

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  1. 20 February, 00:43
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    (a) No. of protons = atomic number = 7

    No. of electrons = no. of protons = 7

    No. of neutrons = mass no. - atomic no. = 6

    (b) No. of protons = atomic number = 16

    No. of electrons = no. of protons = 16

    No. of neutrons = mass no. - atomic no. = 19

    (c) No. of protons = atomic number = 29

    No. of electrons = no. of protons = 29

    No. of neutrons = mass no. - atomic no. = 34

    (d) No. of protons = atomic number = 38

    No. of electrons = no. of protons = 38

    No. of neutrons = mass no. - atomic no. = 51

    Explanation:

    No. of protons = No. of electrons = atomic number

    No. of neutrons = Mass no. - atomic no.

    (a) 13 N 7

    Here atomic number is 7, mass number is 13

    No. of protons = atomic number = 7

    No. of electrons = no. of protons = 7

    No. of neutrons = mass no. - atomic no. = 13 - 7 = 6

    (b) 35 S 16

    Here atomic number is 16, mass number is 35

    No. of protons = atomic number = 16

    No. of electrons = no. of protons = 16

    No. of neutrons = mass no. - atomic no. = 35 - 16 = 19

    (c) 63 Cu 29

    Here atomic number is 29, mass number is 63

    No. of protons = atomic number = 29

    No. of electrons = no. of protons = 29

    No. of neutrons = mass no. - atomic no. = 63 - 29 = 34

    (d) 89 Sr 38

    Here atomic number is 38, mass number is 89

    No. of protons = atomic number = 38

    No. of electrons = no. of protons = 38

    No. of neutrons = mass no. - atomic no. = 89 - 38 = 51
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