Question

Why in a transition elements valence electrons are present in inner shells?

Answer 1

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☺Chemical reactions. The number ofelectrons in an atom's outermostvalence shell governs its bonding behavior. ... An alkaline earth metal of Group 2 (e.g., magnesium) is somewhat less reactive, because each atom must lose two valence electronsto form a positive ion with a closedshell (e.g., Mg2+).
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