Asked Dec 22, 2019
  • The lanthanide contraction explains which of the following periodic trends?
  1. The atomic ratio of the transition metals first decrease and then increase when moving horizontally across each period.
  2. When forming ions the transition metals lose their valence s orbitals before their valence d orbitals.
  3. The radii of the period 5 transition metals are very similar to the radii of the period 6 transition metals.

Expert Answer

Step 1

In rare earth elements, the size of atoms and ions gradually decreases with increasing atomic number from lanthanum to lutetium across period.  The atoms across period in which the nuclear charge increase by one unit with increasing number of elect...

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