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Trends

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by

Harvey Buckle

on 27 February 2018

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Transcript of Trends

Tuesday the 27th February
Periodic Trends
Aim
To know the trends in:

1. Atomic Radius
2. Ionic Radius
3. Ionisation energy
4. Electonegativity
5. Electron affinity

Going across a period and dwon a group of the periodic table.
Ionic Radii
Electron affinity
Defined as:

The first electron affinity is the energy released when 1 mole of gaseous atoms each acquire an electron to form 1 mole of gaseous 1- ions.
Starter
What does:

S, P, D and F block mean?

What element is in group 5 period 3?

What is a Metalloid?


Atomic radius
Unlike a ball, an atom doesn't have a fixed radius. The radius of an atom can only be found by measuring the distance between the nuclei of two touching atoms, and then halving that distance.


Trends in atomic radius in Periods 2 and 3
Four factors
Ionisation energy
This is defined as:

The energy required to remove ONE MOLE of electrons from ONE MOLE of gaseous ions under standard conditions
Now:
Redefine electron affinity and explain the trends
Find the values for group 7 and explain them
1. Nuclear charge
2. Distance
3. Shielding
4. Pairing?
Full transcript