Name: Worked example: Identifying an element from successive ionization energies | Khan Academy
Uploaded: 2020-03-27T17:39:12.000Z
Duration: 2 min 31 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...

- [Instructor] We are told that the first five

ionization energies for a third period element

and see if you can figure it out on your own

So before I even look at a periodic table of elements,

let's make sure we understand what this table

This is telling us that if we start with a neutral atom

And then, it would take another 1,817 kilojoules per mole

And then after that it would take another

2,745 kilajoules per mole to remove the third electron.

And then the fifth electron takes even more,

you do have an increase in ionization energy,

but when you go to the fourth the energy required

So to me, these look like you're removing valence electrons

and these look like you're removing core electrons.

let's look on our periodic table of elements

So we have our periodic table of elements.

and which of these has three valence electrons?

that first electron, it's a reasonable ionization energy.

Then the third, a little bit higher than after that,

but then the fourth, you're starting to go into the core.

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Worked example: Identifying an element from successive ionization energies | Khan Academy

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