Question

Size of fe,co,ni almost same why ? Give reason

Answer 1

Answer:

Atomic radius is inversely proportional to the effective nuclear charge. As we move from left to right in a period the effective nuclear charge increases. This will decrease the radius of an atom. At the same time, in transition elements the number of electrons in the 3d sub-shell will increase. This will repel the already present 4s electrons. This repulsion will increase the atomic radius. In Fe, Co, Ni both the effects nearly balance each other keeping the atomic radius same.

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