Metals which occur in free state. ………… , …………

Phosphorus occus in free state.

Metals occur in the free state and in the combined state. Name two metals which occur in the free or native state. In the combined state metals occur in the form of compounds. Name two different metallic compounds in each case which occur as (i) halides (ii) oxides (iii) sulphides.

Name two metals which occur in native state in nature

Where does hydrogen occur in free state ?

Reactive metals occur in native state.

State how carbon occurs in the free state and in the combined state,

State how hydrogen occurs in the free state. Name three compounds containing hydrogen in the combined state.

The main group elements i.e. representative elements complete their electron configuration using s and p electrons in the periodic table. These elements range from the most metallic to the most non-metallic with intermediate properties, the semi-metals, in between .The elements which occur at the two extremes of the periodic table are highly reactive and therefore, these highly reactive elements do not occur in free state : they usually occur in the combined forms. Beryllium and aluminium exhibit many properties which are similar, but, the two elements differ in :

Assertion (A): Alkali metals do not occur in native state. Reason (R ): Alkali metlas are highly reactive elements.

Boron does not occur in the free state. Why?