The basic strength of lanthanum oxides decreases with rise in atomic number explain and giving reason?
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With an increase in the atomic number, the basic strength of the oxides and hydroxides decreases. The Lanthanide contraction causes a decrease in the size of lanthanide cations and, therefore, the polarizing power of the cations is increased. This decreases the ionic character of the oxides and hydroxides of the lanthanides.
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