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anonymous

  • one year ago

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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  1. anonymous
    • one year ago
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    pls help

  2. Photon336
    • one year ago
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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.

  3. Photon336
    • one year ago
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    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

  4. sweetburger
    • one year ago
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    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.

  5. anonymous
    • one year ago
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    thank you !!!

  6. Photon336
    • one year ago
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    @sweetburger was a little confused at first I thought it was Potassium

  7. sweetburger
    • one year ago
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    I mean you came around to the right answer though which is strontium.

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