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13 March, 09:46

The isotope sodium-20 has how many protons?

Na

22.99

Sodium

O A) 9

OB) 10

OC) 11

OD) 12

+4
Answers (2)
  1. 13 March, 10:27
    0
    Answer:11
  2. 13 March, 13:28
    0
    Option A. 9

    Explanation:

    Isotope results when there is a change in the Neutron number of an atom.

    From the question,

    Mass number of the sodium isotope = 20

    But the atomic number of isotopes are constant. Therefore, the isotope has:

    Proton = 11

    Mass number = Neutron + Proton

    Neutron = Mass number - Proton

    Neutron = 20 - 11 = 9
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