Question

The position of three elements A,B & C in the modern periodic table is

as follows

Element A- period- 2 & group- 17

Element B- period- 1 & group- 1

Element C- Period- 3 & group- 16

(a) Write the formula of the compound formed between (i) B&C (ii) B&A
(b)Is any of the three elements a metal? Give reason to justify your answer.​

Answer 1

Answer:

(a)

(i)Li+S—›Li2S

since elements in group 1 have 1 electron in outer most shell or valency +1, and elements in group 16 have a valency of -2 since they have 6 elements in their outer most shell.

(ii)Li+Cl—›LiCl

since elements in group 17 violently react with ones in group 1 to form compounds and elements in 17 have 7 electrons in outermost shell and have valency -1.

(b)Li from group 1 period 2 is a metal since it gives out an electron to complete it's duet.

Also a note for wherever you got this question there is no element in group 1 and period 1.

there are two elements in period 1 but the elements in group 1 start from Lithium which is in group 2.

so if it was your chemistry teacher tell them about this mistake. it's small but what will students learn right.