The period number represents what property?

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Study for the IGCSE Edexcel Chemistry Test. Access flashcards and multiple choice questions with hints and explanations. Get ready for your exam!

Multiple Choice

The period number represents what property?

Explanation:
The period number shows how many electron shells an atom has. Each period corresponds to a new energy level that electrons can occupy. In period 1, atoms use only the first shell; in period 2, two shells are involved; in period 3, three shells, and so on. Within a given period, electrons fill the outer shell, but the number of shells stays the same until a new shell begins a new period. So the period directly indicates the number of principal energy levels (electron shells) in the atom.

The period number shows how many electron shells an atom has. Each period corresponds to a new energy level that electrons can occupy. In period 1, atoms use only the first shell; in period 2, two shells are involved; in period 3, three shells, and so on. Within a given period, electrons fill the outer shell, but the number of shells stays the same until a new shell begins a new period. So the period directly indicates the number of principal energy levels (electron shells) in the atom.

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