anonymous
  • anonymous
Which of the following elements would exhibit the greatest shielding effect? A. Sodium B. Rubidium C. Lithium D. Potassium
Chemistry
  • Stacey Warren - Expert brainly.com
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chestercat
  • chestercat
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
anonymous
  • anonymous
@Nnesha
Photon336
  • Photon336
greatest shielding means greatest number of shells. the greater number of shells the more the outer electrons are shielded from the nucleus, thus aren't as held tightly.
Photon336
  • Photon336
@kimberNicoleee

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Photon336
  • Photon336
Based on that reasoning, it's most likely going to be B.
anonymous
  • anonymous
Sorry for just now getting back to you! Thank you so much for helping me out.
Photon336
  • Photon336
No problem. Think about it like this: |dw:1446607767573:dw| The closer the electrons are to the nucleus the more tightly they will be pulled. remember in the nucleus is positively charged and electrons are located in shells outside the nucleus.
anonymous
  • anonymous
That makes more sense, the way you put it
Photon336
  • Photon336
now
Photon336
  • Photon336
If we keep adding shells, the electrons become farther from the nucleus |dw:1446608024473:dw|
Photon336
  • Photon336
and what happens is that, they aren't as tightly held A question to YOU Which electron would be easier to remove and why? I circled the electrons. |dw:1446608196466:dw| |dw:1446608170950:dw|
anonymous
  • anonymous
The one in blue right? because it is further out?
Photon336
  • Photon336
exactly
Photon336
  • Photon336
and this is what we mean by shielding
Photon336
  • Photon336
the farther the electrons are from the nucleus, they become shielded and are not as tightly held.
anonymous
  • anonymous
You have no idea how much you helped me better understand this. Thank you so much.
Photon336
  • Photon336
Absolutely, anytime. The ideas underlying this are very simple. if you noticed the number of shells also has to do with something called electronegativity too
Photon336
  • Photon336
If we go down a group this is what happens |dw:1446608554756:dw|
Photon336
  • Photon336
As we go down a period the vertical columns on the periodic table, the number of shells increases. ALSO the electronegativity goes down, because the number of shells increases and the electrons aren't as tightly held by the nucleus. The same thing we discussed earlier.
Photon336
  • Photon336
@KimberNicoleee question for you
Photon336
  • Photon336
What has a higher electronegativity and why rubidium or sodium?
Photon336
  • Photon336
FYI they are in the same group
anonymous
  • anonymous
Would it be Sodium because it's higher up than Rubidium?
Photon336
  • Photon336
Yes, but what can help to explain that based on our discussion?
anonymous
  • anonymous
Rubidium has more shells and the electrons aren't as tightly held by the nucleus while Sodium has less shells and the electrons are held tighter..?
Photon336
  • Photon336
:) yep
Photon336
  • Photon336
You see why this helps right? just knowing that electronegativy increases as you go down a group won't help you out very much
Photon336
  • Photon336
okay last thing see the horizontal lines on the periodic table? those are called periods
Photon336
  • Photon336
if you look at a period something interesting happens. the number of shells stays the same , while the atomic number goes up. that means as we move across a period, the number of protons increases while the number of shells stays the same. how do you think this would affect electronegativty?
anonymous
  • anonymous
Wouldn't it have something to do with the nucleus since protons are inside of there? I know I probably sound really stupid but Chemistry isn't my best subject lol
Photon336
  • Photon336
Yes so if the number of protons goes UP and the number of shells stays the same. the nucleus has more protons and the electrons are held more tightly. Also the electronegativy goes up does that make sense?
anonymous
  • anonymous
That makes perfect sense. (:
Photon336
  • Photon336
so question
Photon336
  • Photon336
look at period 3
Photon336
  • Photon336
which has a higher electronegativy and why> Sodium or Chlorine and why?
anonymous
  • anonymous
Chlorine It has 17 protons while Sodium has 11. The more the protons go up so does the electronegativity.
Photon336
  • Photon336
exactly
Photon336
  • Photon336
so that's part of the reasoning behind why as we go ACROSS a PERIOD that the electronegativity increases
Photon336
  • Photon336
that's why I don't like just blindly memorizing the as you go up this happens as you go down that happens lol
anonymous
  • anonymous
I totally see why now. This subject is pretty much the only one that homeschooling has been hard for me in. I just really appreciate you taking the time to explain it to me rather than simply tell me what the answer is.
Photon336
  • Photon336
Yeah, the best explanation is a simple one. This site has helped me a-lot too. once you understand the WHY the details will become easier to understand and remember. I've spoken to people on here who have had virtual labs. I think for a subject like chemistry you should take a lab class where you get to do the experiments physically. it makes this stuff come alive.
anonymous
  • anonymous
One more question.... Do you understand how to tell if an equation is balanced? I have 2 equations left and I am a bit confused.
Photon336
  • Photon336
@KimberNicoleee I made a tutorial on that
anonymous
  • anonymous
How do I look at it..?

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