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• - [Instructor] In many videos

• and now in this video

• we're going to extend that understanding

• by thinking about the electron configuration of ions.

• These are going to be charged atoms.

• Let's just start looking at some examples.

• Let's say we are dealing with fluorine.

• Now, we know what a neutral fluorine atom's

• electron configuration would be.

• In fact, if you want a little bit of practice,

• try to pause this video

• and think about what is the electron configuration

• of a neutral fluorine atom?

• All right, now let's work through this together.

• A neutral fluorine atom has nine electrons,

• and we could just use our Periodic Table of Elements.

• So first, we're going to have two electrons in 1s.

• So we'll have 1s two.

• And then we're going to go to the second shell.

• So then we go to 2s two.

• So far we have filled in four electrons.

• And next we got to the 2p sub-shell.

• And we are going to have,

• we're talking about a neutral fluorine,

• we are going to have one two three four five electrons

• in that 2p sub-shell.

• So it's 2p five.

• So if that's the electron configuration for fluorine,

• what do you think the electron configuration

• for fluoride would be?

• This is just the anion that has one extra electron.

• It is a negatively charged ion.

• Pause this video and try to figure it out.

• Well, here you're now going to have one extra electron.

• The fluorine has nabbed an electron from someplace

• and so where will that extra electron go?

• Well our 2p sub-shell has space for one more electron.

• So that's where it will go.

• So the fluoride anion is going to have

• an electron configuration of 1s two, 2s two, 2p,

• now it's going to have an extra electron here, 2p six.

• 2p six.

• Now let's do another example.

• Let's say we wanted to figure out the electron configuration

• of a part positively charged calcium ion.

• So calcium, let's make it two plus.

• It has a positive charge of two.

• You could do this as a neutral calcium

• that has lost two electrons.

• What would be its electron configuration?

• Pause this video and try to figure that out.

• All right, well one way to figure this out is

• first we could figure out the electron configuration

• of a neutral calcium atom

• and then from that, we can take two

• of the highest energy electrons away.

• And so neutral calcium, you could view it,

• actually let's do it in noble gas configuration.

• Neutral calcium, the noble gas that comes

• right before calcium is argon.

• So it's going to have the electron configuration of argon

• and then we are going to have two electrons

• for that fourth shell.

• It's going to fill in the 4s sub-shell.

• And so we're going to have argon

• and then we're going to have, let me do this in a new color,

• let's call this 4s two.

• Now what do you think is going to happen

• if we were to lose two electrons?

• Well those two electrons in that 4s sub-shell,

• in the fourth shell, are gonna go away.

• And so the electron configuration here

• for calcium with a positive two charge,

• this calcium cation, is going to be

• the electron configuration of argon and no 4s two.

• So it's actually going to have

• the exact same electron configuration as argon.

• So I will leave you there, just a couple of examples.

• And I encourage you, if you're in the mood,

• just pick any of these atoms, any of these elements,

• and think about what would happen

• if they gained or lost an electron

• and what their electron configurations might be.

- [Instructor] In many videos

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# イオンの電子配置｜原子の構造と性質｜AP化学｜カーンアカデミー (Electron configurations of ions | Atomic structure and properties | AP Chemistry | Khan Academy)

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林宜悉 に公開 2021 年 01 月 14 日