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17 April, 15:35

How many neutrons are present in an atom of Sodium-20?

A. 12

B. 11

C. 10

D. 9

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Answers (1)
  1. 17 April, 18:50
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    Mass number = atomic number (number of protons) + number of neutrons.

    Sodium-20 - 20 is a mass number

    Atomic number you need to find from the Periodic table. It is the ordinal number of the element.

    Atomic number of Sodium (Na) is 11.

    20=11 + number of protons

    Number of neutrons is 20-11=9.

    Correct answer D. 9.
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