anonymous
  • anonymous
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)
Chemistry
  • Stacey Warren - Expert brainly.com
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katieb
  • katieb
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anonymous
  • anonymous
pls help
Photon336
  • Photon336
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.
Photon336
  • Photon336
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

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sweetburger
  • sweetburger
I agree with @Photon336 as Strontium's valence electrons would be the furthest from the nucleus which in turn would have the weakest nuclear attraction to the valence electrons.
anonymous
  • anonymous
thank you !!!
Photon336
  • Photon336
@sweetburger was a little confused at first I thought it was Potassium
sweetburger
  • sweetburger
I mean you came around to the right answer though which is strontium.

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