Boron Bohr Model: Drawing Instructions

Boron has the chemical symbol B and belongs to the 13th group of elements. It’s a metalloid that’s found in trace levels in meteoroids. It has a shiny black look. It is extremely rare both in the universe and on the surface of the earth.

It is found on Earth as water-soluble borate minerals like borax and kernite. Boron is primarily employed in the production of fibreglass, polymers, ceramics, and borosilicate glasses, among other things.

In this tutorial, we’ll look about the Boron Bohr Model and how to build a Bohr Diagram for it. The boron Bohr model revealed additional details about the atom’s structure.

Model of Boron Bohr

Niel Bohr and Ernest Rutherford presented the Bohr Model, or more accurately the Rutherford-Bohr Model, in 1913.

It was an updated version of the Rutherford model, which Bohr enhanced by eliminating certain flaws and incorporating a few new results.

This notion aids in the comprehension of an atom’s structure, constituent particles, and places inside the atom.

So, before we start drawing the Bohr model for Boron, let’s review a few terms:

• Nucleus: An atom’s nucleus is similar to the sun in the solar system. It is made up of positively charged protons and neutral neutrons.

• Protons: Protons are positively charged particles found inside the nucleus of an atom.

•Neutron: These are the neutral particles that exist inside an atom and contribute to the atom’s many features.

• Electron: Negatively charged particles that orbit the nucleus of an atom in specific pathways known as shells, orbits, or energy levels.

• Valence Electrons: The electrons in the atom’s outermost orbit.

According to the Bohr model, the shells in which electrons circulate around the nucleus have specific energies. As a result, they’re often referred to as energy levels.

The shell closest to the nucleus has the least energy and is also known as an atom’s ground state, whereas the shell furthest from the nucleus has the most energy.

These shells were given numerical and alphabetical names by Bohr, with the lowest value being allocated to the shell with the lowest energy, i.e. the one nearest to the nucleus. The shell’s names are K, L, M, N, and so on, or 1, 2, 3, 4, 5, and so on.

The nucleus of the boron atom has 6 neutrons and 5 protons, while 5 electrons orbit the nucleus in two shells known as the K and L shells.

Atomic Weight of Boron

Proton 5 nnnnnnnnnnnnnnnn

Neutron Count 6

The number of electrons is five.

Count of shells 2

2 electrons in the ground (K) shell

The number of electrons in the outer (L) shell is three.

The number of valence electrons is three.

How to Draw the Bohr Model of Boron in Steps

The Boron family belongs to the Periodic Table’s 13th group:

The atomic number, electronic configuration, and atomic mass of the Boron atom are represented in the Periodic table as follows:

The following is information drawn from the Boron box:

• Boron has an atomic number of 5.

Boron has an atomic mass of 10.811.

• Boron is represented by the letter B.

• Boron’s electronic configuration is 1s22s22p1.

To create the Bohr model for Boron, we must first determine the number of distinct atomic particles present in this atom.

The atomic number of an atom is always equal to the number of protons in that atom.

As a result, the number of protons in Boron equals the atomic number of Boron, which is 5.

In addition, the formula for calculating the number of neutrons in an atom is:

The number of neutrons is equal to the atomic mass (rounded to the closest whole number) minus the number of protons.

The atomic mass of the Boron atom is 10.811, which we can round to the nearest whole number to get 11.

As a result, the number of neutrons in Boron is 11 – 5 = 6.

As a result, the nucleus of a Boron atom can be written as:

Protons having a positive charge are represented by p+, and neutral neutrons are represented by n°.

Now, in order to determine the number of electrons in the Boron atom,

Atomic number = quantity of electrons

As a result, the number of electrons in a Boron atom equals its atomic number, which is 5.

Because electrons revolve around the nucleus, let us try to position these neutrons in their proper shells around the nucleus. The formula for calculating the maximum number of electrons that a shell may hold is:

N = 2n2 = maximum number of electrons in a shell

The 1 or K shell is the first shell that surrounds the nucleus. The maximum number of electrons it can hold is calculated as follows:

2 X (1)2 = 2 N = 2 X (1)2 = 2 N = 2 X (1)2 = 2

As a result, only two electrons are allowed in the K shell. The atom’s structure after the K shell is added to the nucleus is as follows:

We now have three more electrons to accommodate after adding these two electrons. So, let’s figure out the greatest number of electrons that can fit into the next shell, the L shell.

2 X (2)2 = 8 N = 2 X (2)2 =

As a result, the L shell can easily accommodate 8 electrons. However, we only have three electrons left in the case of Boron, thus they are deposited in the L shell.

In a shell, electrons are added clockwise, at a 90° angle to each other, starting at the top and working their way down.

Please keep in mind that the above requirement only applies to atoms with up to four electrons in this shell.

The number of electrons added rises in a clockwise direction as the number of electrons increases. However, as the number of electrons rises, the angle between them changes and continues to decrease.

Let us now add electrons to the 2nd or K shell of the Boron atom, bearing the prior facts in mind. The following is the final Bohr model for the Boron atom:

As a result, in the final Bohr model of the Boron atom, the nucleus has 5 protons and 6 neutrons, 2 electrons in the K shell, and 3 electrons in the L shell.

The Bohr model of the atom is still in use today, and the Quantum Mechanical Model is the only model that can match its precision.

When electrons receive energy, they may leap to a higher shell, only to return to their previous energy levels after emitting the energy.

Using the Bohr Model to Deduce Lewis Structure

According to the above-drawn Bohr model of the Boron atom, electrons have two energy levels to choose from, allowing them to move in two orbits or shells around the nucleus.

In its valence shell, the L shell, the boron atom has three electrons.

This makes it simple to depict the Lewis structure of Boron, in which the nucleus is represented by the element’s atomic symbol and the valence shell electrons are represented by dots surrounding the nucleus.

As a result, the Lewis structure of Boron can be shown as follows:


• What is the maximum number of electrons a shell can take in?

The maximum number of electrons that a shell may hold is calculated using the formula 2n2.

Where n is the number of shells.

As a result, the number of electrons in each shell is:

2 X (1)2 = 2 K shell

2 X (2)2 = 8 L shell

2 X (3)2 = 18…. and so on…

• How do you compute the energy released or absorbed by electrons as they move from one energy level to the next?

Plank’s equation is used to compute the energy.

E = E2 – E1 = hv hv hv hv hv hv hv hv h

Where E is the amount of energy absorbed or radiated.

E1 is the energy of the bottom shell.

E2 denotes the energy of the higher shell.

Plank’s constant is h.

v = Frequency of absorbed or transmitted electromagnetic radiation

• Using the Bohr model, determine the number of valence electrons in the Boron atom.

The outermost shell of the Boron atom, according to the Bohr model, is the L shell.

consists of three electrons As a result, the Boron atom has three valence electrons.

• What is Boron’s electronic configuration?

Boron has two electrons in its inner shell and three in its outer shell. The

The electrons in the outer shell are scattered across distinct subshells. The ultimate electronic document

Boron’s configuration is 1s22s22p1.

Boron’s Characteristics

The following are some of Boron’s properties:

• Amorphous boron is brown powder, but crystalline boron is silver to black in hue.

• Boron’s melting and boiling temperatures are 2076 and 3927 degrees Celsius, respectively.

• It can be found in a variety of oxidation states, including -5, -1, 0, +1, +2, and +3.

• Its crystal structure is rhombohedral.

• On the Pauling scale, Boron has an electronegativity of about 2.04.


According to the Bohr Atom Model, Boron has a nucleus with 6 neutrons that are neutral and 5 protons that are positively charged. In addition, five negatively charged electrons orbit the nucleus in precise orbits called energy levels or shells.

The atomic number, which is also equal to the number of electrons in an atom, is equal to the number of protons.

Rounding up the atomic mass to the nearest whole number and subtracting the number of protons yields the number of neutrons.

The formula 2n2, where n is the number of shells, can be used to compute the number of electrons that can be accommodated in any shell of an atom.

The Boron atom is made up of two shells, the K and L shells, which contain two and three electrons, respectively.

Boron’s electrical configuration is 1s22s22p1.

Good luck with your studies!!

Read more: Is CaCO3 Water Soluble?

Misha Khatri
Misha Khatri is an emeritus professor in the University of Notre Dame's Department of Chemistry and Biochemistry. He graduated from Northern Illinois University with a BSc in Chemistry and Mathematics and a PhD in Physical Analytical Chemistry from the University of Utah.


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