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15 October, 00:16

What is the number of neutrons in an atom with atomic mass of 35, three energy levels, and 7 valence electrons?

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Answers (2)
  1. 15 October, 00:24
    0
    Answer: the number of Neutron = 18

    Explanation:

    Mass number = 35

    3 energy levels means 3 shells

    1st shell = 2 electrons

    2nd shell = 8 electrons

    3rd shell = 7 electrons

    Total = 17

    Proton = 17

    Neutron = Mass number - proton

    Neutron = 35 - 17 = 18
  2. 15 October, 00:32
    0
    The answer to your question is 18 neutrons

    Explanation:

    Data

    Number of neutrons = ?

    Atomic mass = 35

    Three energy levels

    seven valence electrons

    Process

    1. - We know that this element is on the third period (3 energy levels)

    2. - We also know that this element is located on group 7A (it is a halogen)

    3. - From the previous information, we conclude that this element is Chlorine.

    4. - Chlorine has an atomic number of 17.

    5. - The number of Neutrons = Atomic mass - atomic number

    = 35 - 17

    = 18
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