Lanthanide contraction explains:
(1) density of the series
(2) atomic volume of the series
(3) chemical activity of the series
(4) size of the atoms of the series

Answer: 4
Explanation:
Lanthanide contraction refers to the decrease in the atomic and ionic radii of elements on moving down the lanthanide series. This contraction is due to the poor shielding effect of the f-orbitals, which result in a strong attraction between the positively charged nucleus and the outer electrons. As a result of lanthanide contraction, the size of atoms in the lanthanide series decreases as atomic number increases.

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