What does the period number indicate?

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Prepare for the WJEC GCSE Chemistry Exam with multiple choice questions and detailed explanations. Enhance your knowledge and boost your confidence. Get exam-ready today!

Multiple Choice

What does the period number indicate?

Explanation:
The period number tells you how many electron shells surround the nucleus. Each shell is an energy level that can hold electrons, and you gain a new shell as you move down the table. So elements in the same period have the same number of shells, while the number of protons, the outer-shell electrons, and the atomic mass come from different properties.

The period number tells you how many electron shells surround the nucleus. Each shell is an energy level that can hold electrons, and you gain a new shell as you move down the table. So elements in the same period have the same number of shells, while the number of protons, the outer-shell electrons, and the atomic mass come from different properties.

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