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The ionisation energy across a period increases as the effective nuclear charge increases but the shielding stays the same.
Effective nuclear charge= the electrostatic 'pull' that an electron 'feels' from a proton in the nucleus, this can be decreased by the shielding from other electrons (as the two negative charges repel one another).see more
A catalyst lowers the activation energy of a reaction and therefore increases the rate of reaction. The catalysts reacts with the reactants but is regenerated again in the reaction so it is not used up.