Answer:
Number of energy levels in each period
Explanation:
The atoms in the first period have electrons in 1 energy level.
The atoms in the second period have electrons in 2 energy levels.
The atoms in the third period have electrons in 3 energy levels.
The atoms in the fourth period have electrons in 4 energy levels
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Answer:
Number of energy levels in each period
Explanation:
The atoms in the first period have electrons in 1 energy level.
The atoms in the second period have electrons in 2 energy levels.
The atoms in the third period have electrons in 3 energy levels.
The atoms in the fourth period have electrons in 4 energy levels