Physics, 17.08.2021 18:10 askharoun2005

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

Valence electrons decrease by one.

The energy levels increase by one.

The energy levels decrease by one.

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When moving across a period from left to right in the periodic table, excluding transition elements,...