Question

P. 7. Four elements A, B, C and D along with their electronic configurations are given below :
Elements
А
CD
Electronic configuration : 2,1 2,8 2,8,1 2,8,8
Now answer the following questions :
(i) Which two elements belong to the same period ?
(ü) Which two elements belong to the same group ?
(ii) Which two elements belong to the 18th group ?
(iv) Which element out of A and C is more reactive and why?
(v) Which element out of A and B forms the maximum number of compounds ?

Answer 1

Answer:

A compound contains atoms of different elements chemically combined together in a fixed ratio. An element is a pure chemical substance made of same type of atom. Compounds contain different elements in a fixed ratio arranged in a defined manner through chemical bonds.