Topic: Lanthanoids and lanthanoid contraction· d- and f-Block Elements
The incorrect statement among the following is :
1. Actinoid contraction is greater for element to element than Lanthanoid contraction.
2. Most of the trivalent Lanthanoid ions are colorless in the solid state.
3. Lanthanoids are good conductors of heat and electricity.
4. Actinoids are highly reactive metals, especially when finely divided.