Why lanthanoid contraction is considered important as compared to actinoid contraction?
Actinoid contraction is considered much higher than lanthanoid contraction.
Actinoids do not show contraction.
Actinoids are more reactive.
Much less chemistry of higher actinoids is known.
Since the actinoids are radioactive and the radioactivity increases as we move across the group, the chemistry of higher actinoids is not well studied and hence the actinoid contraction is not that important.
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