Main Group Elements: Periodic Trends - Video Tutorials & Practice Problems
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1
concept
Periodic Trends
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1m
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Now, as we move to the top right corner of the periodic table, we'll notice that similar periodic trends can be grouped together. Here, we're gonna be talking about periodic trends A versus periodic trends. B for periodic trends. A we say the periodic trends starting with L I or E all increase. These include lattice energy ionization, energy, electron affinity and electron negativity. Now you might notice that this spells out the word lie, a helpful memory tool to help us remember their periodic trend is when you lie, you make stuff up. So here all the periodic trends that begin with L I or E when you lie, you make stuff up, they increase as we go to the top right corner of the periodic table. So these are type A's type B. This has to do with metallic character and atomic radius. So think about it. Why would I need to make two different periodic trends if they were doing the same thing? If periodic trend A is increasing, that would mean by default periodic trend B would be decreasing. So metallic character and atomic radius decrease as we head towards the top right corner of the periodic table. Now here, just to remember, we've talked about ionization energy and electron affinity as well as the other periodic trends in earlier chapters. If you don't quite remember what those are or you haven't seen those videos, make sure you go back and take a look. So especially ionization energy and electron affinity because they can get kind of complex the further into them that we go. So make sure you review those if you need to. So just remember we have periodic trend A and periodic trend B for A, when you lie, you make stuff up, they all increase as we head towards the top right corner trends B decrease as we head towards the top right corner.
2
example
Main Group Elements: Periodic Trends Example
Video duration:
59s
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Here, we're told that group three elements tend to have blank atomic radii and blank ionization energies in group one A elements. So we're looking at group three A versus group one A. So here we would say that atomic radius fits under periodic trend type B. So it decreases as we head towards the top right corner. So as we're going towards the right, we would expect our atomic radius to decrease. So group three A elements would have smaller or lower atomic radii than group one A. So that means the answer is either B or C then ionization energy fits under periodic Tron trend type A which increases as we head towards the top right corner of the periodic table. So here we'd expect a group three A to have a higher ionization energy than group one A. This would mean that our final answer would have to be choice B.
3
Problem
Problem
Rank the following elements in order of increasing lattice energy: S, In, K, Ba and Cl
A
Ba < In < S < K < Cl
B
Cl < S < In < K > Ba
C
Ba < K < In < S < Cl
D
Cl < In < K < S < Ba
E
In < Ba < Cl < S < K
4
Problem
Problem
Which of the following elements will have the lowest electron affinity?
A
Cl
B
K
C
P
D
Be
E
O
5
Problem
Problem
For Group 5A elements, the ionization energy decreases going down a group because:
A
Their atomic masses increases.
B
The highest number of their valence orbital shell increases.
C
Their metallic character decreases.
D
Their electron affinity increases.
E
The number of neutrons in their nuclei decreases.
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