are alkali of alkali earth metals impossible of degrade by chemical process
Every metal is pure if all impurities are removed from it.
according to my opinion your question would be like what is the only pure metal which is available in the earths crust if that was your question the answer is platanium
Most metals are found in the earth's crust as a compound with other elements. However, gold and sometimes platinum are found as pure metals. Platinum is often found as an alloy with other platinum group metals. During the refining process , the precious metals such as gold, platinum and platinum group metals are refined to purity in excess of 99.999%. The other metal which is produced in large quantities with a similar degree of purity is copper, which is also refined electrolytically. Possibly the purest common metal would be mercury., because it is produced by distillation.
