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(B) Generally,the first ionisation energy increases as we move across a period in the periodic table.Rare gases (noble gases) possess a stable electro

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rare gases

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(B) Generally,the first ionisation energy increases as we move across a period in the periodic table.Rare gases (noble gases) possess a stable electronic configuration $(ns^2 np^6)$,which makes it very difficult to remove an electron from their valence shell.Therefore,they have the highest first ionisation energy in their respective periods.Consequently,the peaks in the plot of first ionisation energy versus atomic number are occupied by rare gases.

When first ionisation energy is plotted against the atomic number,the peaks in the curve are occupied by

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