Which of the following statements is not true in regard to transition elements
They readily form complex compounds
They show variable valency
All their ions are colourless
Their ions contain partially filled $ d -$ electron levels
Ammonia is a Lewis base. It forms complexes with cations. Which one of the following cations does not form complex with ammonia
The number of unpaired electrons in $M{n^{ + 3}}$ is
Invar, an alloy of $ Fe$ and $ Ni $ is used in watches and meter scale, its characteristic property is
Which of the will not form an amalgam
The correct order of density is