Why do alkali metals not show variable oxidation states ?

Why do transition elements show variable oxidation state?

(a) Why do transition elements show variable oxidation states? (i) Name the element showing maximum number of oxidation states among the first series of transition metals from Sc (Z = 21) to Zn (Z = 30). (ii) Name the element which shows only + 3 oxidation state. (b) What is lanthanoid contraction? Name an important alloy which contains some of the lanthanoid metals.

Give reason: (i) Transition metals show variable oxidation states. (ii) Actinoids show wide range of oxidation states.

Give reason for the following : (i) Mn shows the highest oxidation state of +7 with oxygen but with fluorine, it shows the highest oxidation state of +4 (ii) Transition metals show variable oxidation states. (iii) Actinoids show irregularities in their electronic configurations.

Which of the following element does not show the variable oxidation state ?

Which of the following element does not show the variable oxidation state ?

Alkali metals show-

Assertion (A): Barium is not required for normal biological function in human beings. Reason (R ): Barium does not show variable oxidation states.

Which one of the following does not exhibit variable oxidation states?

The element that usually does NOT show variable oxidation states is :