Question

An element X occurs in short period having configuration ns² np¹. The formula and nature of its oxide is
(a) XO₃, basic
(b) XO₃ acidic
(c) X₂O₃, amphoteric
(d) X₂O₃ basic

Answer 1

As we learned in concept

Newland's Octaves Law -

Arranged the element in increasing order of their atomic weight and found that every eighth element had properties similar to that of the first element. Law of Octave was found to be true upto calcium.

-

An element having configuration ns2 np1 will show +3 OS and its oxide nature willbe that of its group i.e. Baron, Aluminium, etc.

\therefore X2O3, and amphateric nature.

Option 1)

X03 , basic

This option is incorrect.

Option 2)

XO3 ,acidic

This option is incorrect.

Option 3)

X2O3 , amphoteric

This option is correct.

Option 4)

X2O3, Basic

This option is incorrect.