When moving across a period from left to right in the periodic table (excluding transition elements) which trend occurs?(1 point)ResponsesValence electrons decrease by one.Valence electrons decrease by one.The energy levels decrease by one.The energy levels decrease by one.Valence electrons increase by one.Valence electrons increase by one.The energy levels increase by one.The energy levels increase by one.

Answer 1

When moving across a period from left to right in the periodic table (excluding transition elements), the trend that occurs is that valence electrons increase by one. So, the correct response is:

Valence electrons increase by one.