Atom of seven elementsA,B ,C, D, E,F and G have a differentnumber of electronic shells but havethe same number of electrons in their outermostshells.The element A and C combine with chlorine to form an acidand common salt respectively. The oxide of element A is liquidat room temperatureand is a neutral substancewhile the oxides of theremainingsix elements are basic in nature . Based on the above information, anwerthe followingquestion given ahead : What couldthe elementA be ?

Atom of seven elementsA,B ,C, D, E,F and G have a differentnumber of e

1.	Atom of seven elementsA,B ,C, D, E,F and G have a differentnumber of electronic shells but havethe same number of electrons in their outermostshells.The element A and C combine with chlorine to form an acidand common salt respectively. The oxide of element A is liquidat room temperatureand is a neutral substancewhile the oxides of theremainingsix elements are basic in nature . Based on the above information, anwerthe followingquestion given ahead : What couldthe elementA be ?
Answer» Solution :SINCE all the seven elementshave same NUMBER of electron in their outermostshells, this meansthat they belongto the same group. From the availableinformation , it becomesclear that the group of alkali METALS ( group 1 ) . Hydrogen (A) is also included. The elements presentare : LET us answerthe question asked . The ELEMENT A' is hydrogen (H).