Assertion: Be has complex formation tendency
Reason: Be is s-block element.

Assertion: Be exhibit photoelectric effect. Reason: Be has least IP in the s-block.

Assertion: Be exhibit photoelectric effect. Reason: Be has least IP in the s-block.

The complex formation tendency of alkaline earth metals decreases down the group because :

Assertion (A): s- block elements can form ionic hydrides. Which on electrolysis in fused state give H_(2) gas at cathode. Reason (R) : s-block elements have low IE and low EN as compared to p-block elements.

Assertion (A): s- block elements can form ionic hydrides. Which on electrolysis in fused state give H_(2) gas at cathode. Reason (R) : s-block elements have low IE and low EN as compared to p-block elements.

Group 13 elements form complexes much more readily than the s -block elements because of

Assertion : The highest oxidation state of osmium is +8. Reason : Osmium is a 5d-block element.