The valence electrons of an atom of which element would feel a smaller effective nuclear charge than the valence electrons of a calcium (Ca) atom?
A. magnesium (Mg)
B. Potassium (K)
C. scandium (Sc)
d. strontium (Sr)
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The effect of Z effective nuclear charge increases as you go left to right across a period but decreases as you go down a group b.c increasing number of shells means that the Valence electrons aren't as tightly held by nucleus.
I believe Mg would not be it because it has fewer shells hence electrons are held more tightly. Scandium would have a higher Zeff b.c of the addition of another proton as it increases.
I think it's strontium,but I think that it has more shells, so the valence electrons, wouldn't be held as tightly. So it's Zeff would be less than Calcium