Multiple choice general knowledge science & technology

All of the elements in a period have the same:

  1. number of atomic shells

  2. color

  3. atomic weight

  4. valency
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A Correct answer
Explanation

Elements in the same period (horizontal row) have the same number of electron shells. This is a fundamental periodic trend - as you move across a period, the outermost electrons are added to the same principal energy level.

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