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10 cards from this deck
Group 1 metals (e.g., potassium, sodium, lithium)
Decreases from left to right
Increases from top to bottom
Energy needed to remove an electron from an atom
As ionisation energy decreases, reactivity increases
K: 425425425 kJ/mol (reactive), Au: 896896896 kJ/mol (unreactive)
Larger radius = higher reactivity
Weaker electrostatic force; electrons more easily lost
Inverse relationship (opposite trends)
One measures electron loss, other measures electron gain
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