Ionisation energy
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4 Terms
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IE: down a group
DECREASES.
Atomic radius: increases (lowers)
Nuclear charge: decreases (^)
Electron shielding: increases (lowers)
2
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IE: across a group
INCREASES.
Atomic radius: decreases (lowers)
Nuclear charge: increases(^)
Electron shielding: same
3
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Ionisation energy definition
energy required to remove 1 electron from each atom to form 1 mole of gaseous +1 ions
4
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IE equations
E.g
Sr+(g) —→ Sr2+(g) + e-
This would be the second ionisation energy of strontium
Note 
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