Question

Atoms of 8 elements A,B,C,D,E,F,G & H have the same no of electronic shells but different no of electorns on their outermost shell.It was found that elements A & G combine to form an ionic compound this compound is added in a small amount to almost all vegetable dishes during cooking oxides of elements A & B are basic in nature while those of E & F are acidic. the oxide of D is almost neural based on above information answer= 1.) to which group or period of perodic table do the listed elements belong ? plz explain me how 2.)1.)what would be the nature of compound formed by a combination of elements B & F ? 3.)Which of the 8 elements is most likely to be found in gaseous state at room temperature? 4.) if the no. of electrons in the outermost shell of elements C & G, 3 & 7 respectively write the formula of the compound formed by the combination of C & G. plz explain ythe answer in detail to clear this concept

Answer 1

1)they belongs to same period as they all have same no. of shells.
2) as D is nueral in nature hence the LHS ie ABC are metals basic in nature
while RHS are nonmetals acidic in nature EFG

there fore Compound formed by B &F will be ionic in nature..
3) element most basic or acidic in nature will b gaseous at room temp.
4) firstly we have to know the ionic valancies of C and G Element
as the valanced elec. are 3&7 respectively
there fore ions will be like dis
C^3+ G^1- now just cross their ionic valancy to make the formula
C G
3. 1. cross them
CG3 will b the formula.

Answer 2

(i) The listed chemicals belong to third period; it includes Na, Mg, Al, Si, P, S, Cl& Ar.

(ii) Compound formed by the combination of B (Mg) and F (S) will result in formation of salt called MgSO4.

(iii) Compound A (Na) and B (Mg) are definitely metals as their oxides are basic in nature.

(iv) Element H (Ar), is likely to be found in gaseous state at room temperature as it is the 8th element of the group so it would have 8 electrons in its outermost shell which is the electronic configuration of an Nobel gas.

(v) They will form AlCl3 (Aluminium chloride).