ShmoopTube

Where Monty Python meets your 10th grade teacher.

Search Thousands of Shmoop Videos


Science Videos 686 videos

Phenotype
948 Views

Don't like how someone looks? Blame their phenotypes.

Phospholipids
7339 Views

Anything that has a cell (bacteria, listen up!) has phospholipids that keep the cell contained and give it form and shape. Phospholipids protect us...

What Would Mary Shelley Think of GMOs?
1343 Views

GMOs. Now that’s a scary word. Or is it? Guess it’s time to ask ourselves: WWMST? ...For those of us who don’t constantly ask ourselves “wh...

See All

Chemistry: 5.8 Periodic Trends 120 Views


Share It!


Description:

Trends come and go periodically, but this periodic trend is here to stay. Forever. How is that possible? Check out the video to find out.

Language:
English Language

Transcript

00:03

Meet Yolanda. Yolanda likes

00:06

things done a certain way. It goes beyond [Yolanda waving]

00:08

just needing every hair on her head to

00:11

be perfectly in place or insisting on [Yolanda combing her hair]

00:13

wrinkle-free clothing. Everything on her [Yolanda ironing]

00:15

desk needs to be at precise 90 or 180

00:18

degree angles from the edges. The

00:21

thermostat must always be set at exactly [Yolanda adjusting the thermostat]

00:24

70 degrees she arranges the corn flakes

00:27

in her cereal bowl into fractal patterns.

00:29

Yeah... it's intense. Anyway, so it's no wonder

00:32

that she's picky about the way her

00:34

elements are organized. If her table of [Messy table of elements]

00:37

elements looked like this, she'd have a

00:39

complete and total freak out. Yeah, she's

00:42

got a few simple rules. First, all

00:44

elements must be organized by atomic

00:46

radius. Atomic radius, which is one half

00:50

the distance between the nuclei of two

00:52

atoms, is used to determine an atom's size. [The atomic radius is shown on an element]

00:56

When Yolanda arranges her elements,

00:58

she demands that the atomic radii decrease

01:01

from left to right and increase from top [The direction of the decrease and increase are shown by arrows]

01:04

to bottom, like so. Yolanda's second

01:06

major ask is that the elements are

01:08

organized according to [The rules being written on a checklist]

01:10

electronegativity. Here, she prefers--okay,

01:13

prefers may not be a forceful enough word-- [Yolanda with her arms crossed]

01:16

that electronegativity, or an atom's

01:19

ability to attract an electron, increases

01:21

from left to right and decreases from

01:24

top to bottom.

01:25

There, perfect. We should be good on all

01:27

this now right? But no, Yolanda's [Dog looking disappointed]

01:29

fussiness knows no bounds. Her next

01:32

requirement is that the elements'

01:33

ionization energy, or the amount of

01:36

energy needed to remove an electron from

01:38

an atom, increases from left to right and [The elements are shown organised by their ionization energy]

01:41

decreases from top to bottom.

01:43

Well great...what top-notch organization.

01:46

Doesn't look like it could be improved

01:47

upon even a smidge. [Yolanda's dog giving a paw]

01:49

Oh, but wait: Yolanda also has a thing about

01:52

electron affinity, which is the measure

01:55

of how much an atom "wants" another

01:57

electron. Are they as hungry for one as this guy, [Guy with 4 burgers in front of him]

02:00

or are they more the house salad type? [Guy sat with a plate of salad]

02:03

Well, Yolanda won't settle for any

02:05

organizational approach that doesn't have

02:06

elements increasing

02:08

to electron affinity from left to

02:11

right and decreasing from top to bottom.

02:13

And wouldn't you know it? Yolanda's table looks [The periodic table is shown]

02:15

a bit like the periodic table. In fact, it

02:18

looks exactly like the periodic table,

02:20

which is because when the periodic table

02:22

was first put together in its current format, [Guy putting together the periodic table in segments]

02:24

it was assembled by an individual who

02:27

was as passionate as Yolanda about [Dmitri Mendeleev's dog saying "He never pets me."]

02:29

achieving a harmonious composition.

02:32

Unfortunately for our hero, she's going

02:34

to be a wee bit bummed when she finds

02:35

out that her submission for the Yolanda

02:38

table of the elements was denied by the

02:41

U.S. Patent Office. [Denied stamp on her application]

Related Videos

Jane Eyre Summary
123033 Views

When you're about to marry the love of your life, not many things could stop you. However, finding out that your future hubby is keeping his crazy...

What is Shmoop?
91412 Views

Here at Shmoop, we work for kids, not just the bottom line. Founded by David Siminoff and his wife Ellen Siminoff, Shmoop was originally conceived...

ACT Math 4.5 Elementary Algebra
492 Views

ACT Math: Elementary Algebra Drill 4, Problem 5. What is the solution to the problem shown?

AP English Literature and Composition 1.1 Passage Drill 1
1039 Views

AP® English Literature and Composition Passage Drill 1, Problem 1. Which literary device is used in lines 31 to 37?

AP English Literature and Composition 1.1 Passage Drill 2
683 Views

AP® English Literature and Composition Passage Drill 2, Problem 1. What claim does Bacon make that contradicts the maxim "Whatsoever is delig...