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 increase by one. The energy levels increase 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 decrease by one.
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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 an additional proton in its nucleus and an additional electron in its outermost energy shell (valence shell), thus increasing the number of valence electrons.
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