anonymous
  • anonymous
The first four ionization energies for element X (not in kJ/mol) are 170, 350, 1800, 2500. The first four ionization energies for element Y are 200, 400, 3500, 5000. Identify elements X and Y. (There may be more than one correct answer) Am I right if I say element X may be Magnesium and element Y may be Calcium?
Chemistry
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SOLVED
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schrodinger
  • schrodinger
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anonymous
  • anonymous
well the IE jumps at the removal of a valence electron after the ion is stable and both of these jump at the removal of their 3rd electron meaning that have to be in group 2
anonymous
  • anonymous
would that be correct?
chmvijay
  • chmvijay
yaa that is correct why mg ? why not sr ?

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anonymous
  • anonymous
because Mg has less shielding and Sr would have a larger I1
abb0t
  • abb0t
You know, I just took inorganic II last Winter and we kind of went over this stuff and I forgot all of this. Funny, huh?
anonymous
  • anonymous
I would say yes but I need help so it's kinda not funny :)
abb0t
  • abb0t
Ok, well Sr would have a larger l1? What does that mean?
anonymous
  • anonymous
wait no it would have a smaller \(\text{I}_1\) -- more shielding, less energy
chmvijay
  • chmvijay
thats right
anonymous
  • anonymous
Sr isnt what I'm asking though...would it be correct to say element X may be Mg and element Y may be Ca? @abb0t
abb0t
  • abb0t
If I remember correctly, yes. Shielding increases as you move down the periodic table, due to atomic size.
anonymous
  • anonymous
so I'm right?
abb0t
  • abb0t
Yeah, anything that has 2 valence \(e^-\) I would say is correct.
anonymous
  • anonymous
alright, thanks guys! :)
abb0t
  • abb0t
Sr would be a valid answer too. but then your x, would not be Mg, based on the given info. It would be Ca\(^{2+}\)

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