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Ionisation potential increases over a period from left to right because theAtomic radius increases and nuclear charge increasesAtomic radius decreases and nuclear charge increasesAtomic radius decreases and nuclear charge decreasesAtomic radius increases and nuclear charge decreases

Question

Ionisation potential increases over a period from left to right because theAtomic radius increases and nuclear charge increasesAtomic radius decreases and nuclear charge increasesAtomic radius decreases and nuclear charge decreasesAtomic radius increases and nuclear charge decreases

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Solution

Ionisation potential increases over a period from left to right because the Atomic radius decreases and nuclear charge increases.

Here's why:

  1. Atomic Radius Decreases: As we move from left to right across a period in the periodic table, the number of protons in the nucleus increases. This increases the positive charge of the nucleus which pulls the electrons closer, decreasing the atomic radius.

  2. Nuclear Charge Increases: The increase in the number of protons as we move from left to right across a period also increases the overall positive charge of the nucleus. This increased nuclear charge means that more energy (ionisation potential) is required to remove an electron from the atom.

So, the correct answer is "Atomic radius decreases and nuclear charge increases".

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