Name the element which is invariably bivalent and whose oxide is soluble in excess of NaOH and its dipositive ion has a noble gas core.

Name the element which is invariably bivalent and whose oxide is solub

1.	Name the element which is invariably bivalent and whose oxide is soluble in excess of NaOH and its dipositive ion has a noble gas core.
Answer» um (Be) is the element belongs to second group in the periodic table. It is amphoteric and REACTS with acid and bases and is invariably DIVALENT. Its oxide i.e., Beryllium Oxide DISSOLVES in the excess of Sodium HYDROXIDE (NaOH) and gives sodium berrylate and WATER. The dipositive ion of Beryllium Oxide has a soluble Noble gas core and also