Factors Effecting Ionisation Energies and Orbital Structure - AS OCR Chemistry Unit 1

Throughout my AS level chemistry i have endeavored to create a collection of my class notes and revision notes, that i will type up and folder. So i can use them for revision purposes, but then i thought how time consuming this is for me, probably why i didn't think of this sooner!
So i have decided to share all my class notes and revision resources on here for other people studying whom don't have the time to sit and type them all up :)

This Particular one gives a brief outline of the factors affecting ionisation energies, and a detailed description on the structure of orbitals, with plenty of diagrams for visual learners!

If you would like anything requested please feel free to comment, i will be adding more and more through out the course.

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Preview of Factors Effecting Ionisation Energies and Orbital Structure - AS OCR Chemistry Unit 1

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Molly Graystone ­ Chemistry
Orbitals
Factors Effecting ionisation Energy.
1. Atomic Radius
Greater atomic radius the easier it is to remove outer electrons, resulting in a smaller
ionisation energy needed. As the outer electron is further from the nucleus, meaning less
pull.
Potassium gas a smaller first ionisation energy than sodium as potassium has a larger atomic
radius.
2. Nuclear Charge
Aluminium will have a high 1st ioisation energy because atomic radii decreases along a period
as the nuclear charge also increases although electron shielding stays the same.
The more protons the more pull on the outer electron.
3. Electron shielding
The repulsion between electrons in different inner shells. Shielding reduces the net attractive
force from the positive nucleus on the outer electrons.
Orbital Structure
o Shells are made up of sub shells.
o Sub shells are made up of orbitals.
Orbital is a volume of space in an atom where there is a high probability of finding an electron.

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Molly Graystone ­ Chemistry
1st Shell- Has only one sub shell
S- sub shell (1 orbital)
2nd Shell- Has two sub shells
S- sub shell
P- sub shell (3 orbitals)
3rd Shell- Has three sub shells
S- sub shell
P- sub shell
D- sub shell (5 orbitals)
4th Shell- Has four sub shells
S- sub shell
P- sub shell
D- sub shell
F- sub shell (7 orbitals)…read more

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Molly Graystone ­ Chemistry
Aufbaus Principle
Electron orbital configuration, uses sub shells.
E.g.
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2...…read more

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