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Anything that influences the valence ele...

Anything that influences the valence electrons will affect the chemistry of the element. Which one of the following factors does not affect the valence shell?
(A) Valence principal quantum number (n).
(B) Number charge (Z).
(C) Nuclear mass
(D) Number of core electrons.

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(C) nuclear mass does not affect the valence shell electrons (such as, `""_(1)^(2)H and ""_(1)^(1)H` have similar chemical properties.
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