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magnesium, if alkali earth means the 2nd column, Sodium if it means the first, but i think it is magnesium. I am positive it is the third row.

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When electrons move to lower levels they lose energy?

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Yes, atoms can change energy levels by absorbing or emitting energy in the form of light or heat. This process is known as electronic transitions. When an atom absorbs energy, its electrons move to higher energy levels, and when it emits energy, its electrons move to lower energy levels.


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