When moving across a period from left to right in the periodic table (excluding transition elements) which trend occurs?(1 point) Responses The energy levels decrease by one. The energy levels decrease by one. Valence electrons increase by one. Valence electrons increase by one. Valence electrons decrease by one. Valence electrons decrease by one. The energy levels increase by one.
1 answer
When moving across a period from left to right in the periodic table (excluding transition elements), the correct trend is: Valence electrons increase by one.
As you move from left to right in a period, each successive element adds one more valence electron to its outer shell.
