# Beryllium orbital diagram

In the beryllium orbital diagram, the 1s subshell accommodates two electrons, and the 2s subshell holds another pair, totaling four electrons.

To depict the beryllium orbital diagram, start by determining the number of electrons from the periodic table. Note the electron configuration, and follow the three essential rules: Aufbau principle, Pauli exclusion principle, and Hund’s rule. This systematic approach ensures an accurate representation of beryllium’s orbital arrangement.

Contents

## Steps

### Find electrons

The atomic number of beryllium represents the total number of electrons of beryllium. Since the atomic number of beryllium is 4, the total electrons of beryllium are 4.

### Write electron configuration

The electron configuration of beryllium is 1s2 2s2.

Now in the next step, start drawing the orbital diagram for beryllium.

### Draw orbital diagram

Before drawing the orbital diagram, you should know the three general rules.

• Aufbau principle – electrons are first filled in lowest energy orbital and then in higher energy orbital
• Pauli exclusion principle – two electrons with the same spin can not occupy the same orbital
• Hund’s rule – each orbital should be first filled with one electron before being paired with a second electron

Also, you should know the number of orbitals in each subshell.

We can calculate the number of orbitals in each subshell using the formula: 2ℓ + 1

Where, ℓ = azimuthal quantum number of the subshell

For s subshell, ℓ = 0
For p subshell, ℓ = 1
For d subshell, ℓ = 2
For f subshell, ℓ = 3

So each s subshell has one orbital, each p subshell has three orbitals, each d subshell has five orbitals, and each f subshell has seven orbitals.

Now start to draw!

As mentioned above, the electron configuration of beryllium is 1s2 2s2. Hence, draw the blank orbital diagram of beryllium up to 2s subshell as follows:

In the above orbital diagram, the box represents an orbital. Each orbital has a capacity of two electrons. And the arrows (↑↓) are drawn inside the box to represent electrons.

Now 1s2 indicates that the 1s subshell has 2 electrons. So draw two arrows in the 1s box showing two electrons as follows:

2s2 indicates that the 2s subshell has 2 electrons. So draw two arrows in the 2s box showing two electrons as follows:

That’s it! This is the final orbital diagram of beryllium as we have used all 4 electrons.