Question

based on the group valency of element write the molecular formula of the following compound 1)oxide of first group element 2) halide of the element of group thirteen 3)compound formed when an element A of group 2 combine with an element B of group seventeen​

Answer 1

ANSWER 1

X2O

EG NA2O

ANSWER 2

HALIDE =HALOGENS =GROUP 17

XY3


EG ALCL3 OR BF3

ANSWER 3

AB2


EG MGCL2 OR BEF2

THANKS

Answer 2

1.) $M_2O$ , where M is element of first group e.g., Li, Na, K, Rb, Cs. elements of first group are electropositive (metal), valency of these elements = 1 while valency of oxygen is 2 and electronegative (non-metal).

for example, $Na_2O,K_2O.$

2)$MX_3$, where M is element of group 13th, and X is element of halogen family. we know, group 13th elements are trivalent while halogens are monovalent.

for example, $AlCl_3,BF_3$

3) $AB_2$, A is element of 2nd group (alkaline earth metal) and B is element of 17th group (halogen family)

for example, $MgCl_2,CaF_2$