Why S-block elements are called alkali metals.

What are d-block elements?

Why the metallic character of alkali metals increase down the group?

In p-block elements the lower oxidation state is favoured by heavier elements where as in d-block elements this is just opposite why?

Why are majority of plant nutrient elements are called mineral nutrients?

Explain the folloiwng phenomenon: Transition metals are much harder than the alkali metals.