Question

I forgot how to do this can someone help please

Answer 1

8 a

The atomic symbol is
`_(12)^(24)\text{Mg}^(2+)`.

The 2+ superscript tells you that the atom has two + charges. It must add two – charges (electrons) to become a neutral atom.

The equation for the process is

`_(12)^(24)\text{Mg}^(2+) + 2e^(-) \rightarrow _(12)^(24)\text{Mg}`

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8 b i

A neutral Mg atom has no charge because it has 12 protons (+)

and 12 electrons (-).

12(+)+ 12(-) = +12 – 12 = 0

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8 b ii

A magnesium atom loses two electrons when it forms an ion. The ion has

12 protons and 10 electrons.

12(+) + 10(-) = +12 – 10 = +2