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31 December, 06:56

20. An atom has a mass of 50 and 20 protons. How many

neutrons does it have?

Answer:

+5
Answers (1)
  1. 31 December, 08:45
    0
    30

    Explanation:

    The mass number (A) is the sum of the numbers of protons and neutrons.

    A = p + n

    If p = 20,

    n = A - p = 50 - 20 = 30
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