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Answer:

The period number tells which is the highest energy level occupied by the electrons.

Explanation:

  1. The period number (denoted by n) is the outer energy level that is occupied by electrons in an atom.
  2. The period number that an element is in, is the number of energy levels that the element has.
  3. When we move across a period from left to right in a periodic table the number of electrons in atoms increases within the same orbit.

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