Chapter U1.18, Problem 4E

Interpretation Introduction

Interpretation:

The sub-shell model of boron, needs to be drawn and core and valance electrons needs to be identified.

Concept introduction:

One or more orbitals in the electron shell of an atom with the equal energy level are known as sub-shells. Sub-shells contain different shapes and are identified by their magnetic quantum number.

Answer to Problem 4E

Explanation of Solution

The atomic number of boron is 5. Its electronic configuration is as follows:

$1s^{2}2s^{2}2p^1$

From the above configuration, it has 2 core electrons and 3 valence electrons. The valence electrons are the electrons which only take part in bonding. The core electrons do not take part in bonding.

The sub-shell model is represented as follows: