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8 March, 15:23

The table below shows the number of sub-atomic particles in an atom of magnesium. Sub-atomic Particles Sub-atomic Particle

Protons 12

Neutrons 12

Electrons 12

What is the amu of a magnesium atom?

A: 0

B: 12

C:24

D:36

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Answers (2)
  1. 8 March, 15:33
    0
    24, because to get the AMU of an element you just add the number of protons and neutrons, because of the fact that electrons weight next to nothing.
  2. 8 March, 15:48
    0
    Answer: The mass number of magnesium atom is 24 amu.

    Explanation:

    Atomic number is defined as the number of protons or electrons that are present in a neutral atom.

    Atomic number = number of protons = number of electrons

    Mass number is defined as the sum of number of protons and neutrons that are present in an atom. It is expressed in 'amu'

    Mass number = Number of protons + Number of neutrons

    For the given element, "magnesium"

    Number of protons = 12

    Number of neutrons = 12

    Number of electrons = 12

    Mass number = 12 + 12 = 24

    Hence, the mass number of magnesium atom is 24 amu.
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