what is lanthanoid contraction ?
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The regular decrease in size of atoms and ions with increase in atomicno.,is known as lanthanoid contraction.
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Hey !!
In lanthanoids, with increasing atomic number, the atomic and ionic radii decreases from one element to the other, but the decrease is very small. It is because, for every additional proton in the nucleus, the corresponding electron goes into a 4f-subshell, which is too diffused to screen the nucleus as effectively as the more localised inner shell. Hence, the attraction of the nucleus for the outermost electrons increases steadily with the atomic increases.
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