📖 what
What is a valence electron?
Quick Answer
A valence electron is an electron in an atom’s outermost shell that participates in bonding and chemical reactions. The number of valence electrons strongly affects reactivity.
The Full Story
Elements in the same periodic group often have the same number of valence electrons, which is why they behave similarly. For example, alkali metals have one valence electron, while halogens have seven. Atoms usually gain, lose, or share valence electrons to form bonds and become more stable. Understanding valence electrons is key to predicting formulas, reactions, and molecular shape.
Key Facts
1.Valence electrons are in the outermost shell
2.Group 1 elements typically have 1 valence electron
3.Group 17 elements typically have 7 valence electrons
YouTube Angle
Suggested video title for this topic:
"The electrons that decide how elements react"
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