Question

Which of the following elements would exhibit the greatest shielding effect?

A. Sodium
B. Rubidium
C. Lithium
D. Potassium

Answer 1

@Nnesha

Answer 2

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.

Answer 3

@kimberNicoleee

Answer 4

Based on that reasoning, it's most likely going to be B.

Answer 5

Sorry for just now getting back to you! Thank you so much for helping me out.

Answer 6

No problem. Think about it like this:



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.

Answer 7

That makes more sense, the way you put it

Answer 8

now

Answer 9

If we keep adding shells, the electrons become farther from the nucleus

Answer 10

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.

Answer 11

The one in blue right? because it is further out?

Answer 12

exactly

Answer 13

and this is what we mean by shielding

Answer 14

the farther the electrons are from the nucleus, they become shielded and are not as tightly held.

Answer 15

You have no idea how much you helped me better understand this. Thank you so much.

Answer 16

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

Answer 17

If we go down a group this is what happens

Answer 18

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.

Answer 19

@KimberNicoleee question for you

Answer 20

What has a higher electronegativity and why rubidium or sodium?

Answer 21

FYI they are in the same group

Answer 22

Would it be Sodium because it's higher up than Rubidium?

Answer 23

Yes, but what can help to explain that based on our discussion?

Answer 24

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..?

Answer 25

:) yep

Answer 26

You see why this helps right? just knowing that electronegativy increases as you go down a group won't help you out very much

Answer 27

okay last thing see the horizontal lines on the periodic table? those are called periods

Answer 28

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?

Answer 29

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

Answer 30

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?

Answer 31

That makes perfect sense. (:

Answer 32

so question

Answer 33

look at period 3

Answer 34

which has a higher electronegativy and why>

Sodium

or

Chlorine

and why?

Answer 35

Chlorine

It has 17 protons while Sodium has 11. The more the protons go up so does the electronegativity.

Answer 36

exactly