Ionisation enthalpies of Ce, Pr and Nd are higher than Th, Pa and U. Why?
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1️⃣All these elements lie in inner transition metal block.
2️⃣Ce, Pr and Nd lie in 6th period and Th, Pa and U lie in 7th period.
3️⃣As we move down the group, the size increases as the shell increases.
4️⃣So, it becomes easy to remove electron from outermost orbital for bigger atoms, due to less effective nuclear charge.
5️⃣Thus ionisation energy is less for 7th period elements than 6th period elements.
6️⃣That is why Ce, Pr and Nd have higher ionisation energy than Th, Pa and U.
2️⃣Ce, Pr and Nd lie in 6th period and Th, Pa and U lie in 7th period.
3️⃣As we move down the group, the size increases as the shell increases.
4️⃣So, it becomes easy to remove electron from outermost orbital for bigger atoms, due to less effective nuclear charge.
5️⃣Thus ionisation energy is less for 7th period elements than 6th period elements.
6️⃣That is why Ce, Pr and Nd have higher ionisation energy than Th, Pa and U.
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Ionisation enthalpies of Ce, Pr and Nd are higher than Th, Pa and U. Why?
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1️⃣All these elements lie in inner transition metal block.
2️⃣Ce, Pr and Nd lie in 6th period and Th, Pa and U lie in 7th period.
3️⃣As we move down the group, the size increases as the shell increases.
4️⃣So, it becomes easy to remove electron from outermost orbital for bigger atoms, due to less effective nuclear charge.
5️⃣Thus ionisation energy is less for 7th period elements than 6th period elements.
6️⃣That is why Ce, Pr and Nd have higher ionisation energy than Th, Pa and U.
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