Which statement describes the properties of lanthanoids and actinoids
1) Both lanthanoids and actinoids are part of the f-block elements in the periodic table.
2) They have similar electron configurations where the 6s and 5f orbitals are being filled.
3) Lanthanoids include the elements with atomic numbers 57 to 71 (cerium to lutetium), while actinoids include the elements with atomic numbers 89 to 103 (actinium to lawrencium).
4) Lanthanoids and actinoids are generally classified as rare earth elements due to their rarity and unique properties.
5) They are all metals with similar chemical properties, displaying a high degree of reactivity with oxygen and forming stable oxides.
6) They have high melting and boiling points compared to other elements.
7) Both lanthanoids and actinoids exhibit a range of oxidation states, with the +3 oxidation state being the most common.
8) Lanthanoids and actinoids have unique magnetic properties due to the presence of partially filled f-orbitals.
9) They have a tendency to form complex compounds and exhibit a wide range of coordination numbers in these compounds.
10) Many lanthanoids and actinoids are radioactive, with unstable isotopes that undergo radioactive decay.