Name: Introduction to electron configurations | AP Chemistry | Khan Academy
Uploaded: 2020-04-06T07:49:23.000Z
Duration: 5 min 8 s
Description: Thousands of YouTube videos with English-Chinese subtitles! Now you can learn to understand native speakers, expand your vocabulary, and improve your pronunciation...

that electrons don't just orbit a nucleus

the way that a planet might orbit a star,

where an electron is at any given point in time,

we're really thinking about probabilities,

where is it more or less likely to be found.

And this diagram shows us the types of orbitals

which can be found in the various subshells

the p subshell that has three different orbitals in it,

you have the d subshell that has one, two, three,

So if you're thinking about the subshell,

about electron configurations for particular atoms.

about the electron configuration of the simplest element.

If we're talking about a neutral hydrogen atom,

a neutral hydrogen atom, it has an atomic number of one

and if it's neutral, that means it has one electron.

Well it would be in the lowest energy level

It only has an s subshell, and so that one electron

in that neutral hydrogen atom would go over there.

So we would say its electron configuration 1s1,

So instead of just having one electron in that first shell,

So its electron configuration would be 1s2.

so the first two could go to the first energy level,

the first shell, so the first two will go 1s2,

and the subshell that it's going to fill first

So notice, two electrons in the first shell

Well, that's gonna look a lot like lithium

So two of them are going to go into the first shell, 1s2,

and then the next two are going to fill up the s subshell

which would be the case in a neutral beryllium atom.

A neutral boron would have five electrons.

So the first two we're going to fill the first shell, 1s2,

to the second shell and fill up the s subshell 2s2,

and then we're going to start filling up the p subshell.

So let's see, we have one more electron so we go 2p1.

And then what happens when we go to carbon?

but now we have one more electron to deal with

in the second shell because that can fit six electrons.

So we're going to fill the first shell with two electrons

Now you can imagine as we get to larger and larger atoms

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Introduction to electron configurations | AP Chemistry | Khan Academy

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