Question: The lanthanide contraction is often given as an explanation for the fact that the 6th period transition elements have: 1. densities smaller than that of

The "lanthanide contraction" is often given as an explanation for the fact that the 6th period transition elements have: 1. densities smaller than that of the 3rd period transition elements. 2. atomic radii that are similar to the 5th period transition elements. 3. melting points that are lower than the 5th period elements

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