Chapter 2, Problem 2.76AP

Interpretation Introduction

Interpretation:

Valance sub shell occupied by the electron should be identified for beryllium and arsenic atom.

Concept introduction:

The periodic table is given below,

The electron configuration is the distribution of electrons of an atom or molecule in atomic or molecular orbitals. Atom consists of s, p, d, and f orbitals.

The Aufbau principle:

The Aufbau principle is states that in the ground state of an atom, electrons fill atomic orbitals of the lowest available energy levels before occupying higher levels. For example, the 1s shell is filled before the 2s subshell is occupied.

The subshell ordering by this rule is

$\text{1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f, 6d, 7p, 8s, }\mathrm{...}$