Chemistry

Fill in the missing information in the following table of four neutral atoms

Symbol- 37Cl

number of protons- 36 46

number of neutrons- 42

number of electrons- 33

mass number- 77 106

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  1. I don't understand

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  2. I'm looking for the missing information in the table

    symbol-

    number of protons-36

    number of neutrons-42

    number of electrons-

    mass number-

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  3. The number of protons in 37 Cl is 17. What's confusing is I don't know what the 36 46 means.
    The number of neutrons is 37-17 = 20. I don't understand the 42.
    The number of electrons is 17.
    The mass number is 37. I don't understand the 77 106.

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