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17 August, 17:07

What is the mass number of the isotope lithium-7?

Lithium has 3 protons. How many neutrons are in the isotope lithium-8?

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Answers (2)
  1. 17 August, 19:15
    0
    5 neutrons are in the isotope lithium-8

    Explanation:

    In the periodic table, lithium being the third element, its atomic number will be 3. i. e. it has 3 protons.

    The atomic number = proton number

    i. e. 3,

    again we know that Mass number - proton number = neutron number.

    In the given case it is, 8-3=5

    In isotope 8 mass number will be 8, so as in isotope 7 it will be 7.

    being a 3rd element in the periodic table its K shell contains 2 electron and L shell has 1 electron.
  2. 17 August, 19:33
    0
    What is the mass number of the isotope lithium-7

    7

    Lithium has 3 protons. How many neutrons are in the isotope lithium-8?

    5
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