Chapter U1, Problem 21STP

Interpretation Introduction

Interpretation:

The compound which is generally not formed needs to be identified.

Concept introduction:

The elements are arrangedin the periodic table in increasing an atomic number. All of these elements show numerous other trends and the periodic law and table can be usedexplain their physical, chemical, and atomic properties.

Answer to Problem 21STP

(B) NeBr₂

Explanation of Solution

In the given problem, there are three compounds, KBr, NeBr₂ and AlBr₃.

The electronic configuration of potassium is $\left[Ar\right]4s¹$ which means it contains one electron in its outer most shell. The electronic configuration of Neon is $\left[He\right]2s^{2}2p^6$ its outermost shell is completely filled with 8 electrons. The electronic configuration of Aluminum is $\left[Ne\right]3s²3p¹$ and its outer most shell contains 3 electrons. So, based on the given compounds NeBr₂ is not formed because neon is an inert gas having complete octet and it does not form compounds with other elements.

So, the correct option is (B) NeBr₂.