When moving across a period from left to right in the periodic table (excluding transition elements) which trend occurs?(1 point)

Question

Responses

The energy levels decrease by one.
The energy levels decrease by one.

The energy levels increase by one.
The energy levels increase by one.

Valence electrons increase by one.
Valence electrons increase by one.

Valence electrons decrease by one.

Answer 1

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 across a period, each successive element has one more valence electron than the previous element.