Chem Explorers

Unleashing the Power of Atomic Energy: From Francium to Medical and Nuclear Fields

Atomic Structure

Discovering the secrets of the microscopic world has been the quest of countless scientists throughout history. The field of atomic structure has played a vital role in shaping our understanding of the world around us. In this article, we will delve into the basic information surrounding atomic structure as well as exploring the Francium Bohr Model.

The Atom

The atom is the fundamental unit of matter. It is composed of a nucleus, which contains protons and neutrons, and electron shells which surround the nucleus.

  • Protons have a positive charge.
  • Neutrons are neutral.
  • Electrons have a negative charge.

The nucleus is found in the center of the atom, while the electrons occupy space surrounding the nucleus.


The nucleus is the densest region of an atom. It is composed of protons and neutrons, which are held together by the strong nuclear force. This force binds the nucleus, keeping the positive protons from repelling each other due to their like charges.


Protons are positively charged particles found within the nucleus of an atom. Each element has a unique number of protons in its nucleus, which determines its place on the periodic table. For example, hydrogen has one proton, whereas carbon has six protons.


Neutrons are particles found within the nucleus of an atom that have no charge. They help to stabilize the nucleus as the number of neutrons can alter the properties of an element. For example, carbon can have six neutrons, seven neutrons, or eight neutrons, which creates isotopes of carbon with different properties.

Electron Shells

Electron shells are areas surrounding the nucleus where electrons are found. Electrons orbit the nucleus in specific shells, each with its own energy level. Electron shells closest to the nucleus have the lowest energy level, while those farther away have higher energy.

Francium Bohr Model

Bohr Diagram

The Bohr model, also known as the Bohr diagram, is a simplistic representation of an atom. It was introduced by Niels Bohr in 1913 to explain the behavior of electrons in an atom. The Bohr diagram shows the nucleus in the center with the electrons orbiting around it in specific shells.


The shells, or energy levels, where electrons are found in an atom are represented by circles in the Bohr diagram. Each shell is given a number, with the closest shell to the nucleus having the lowest energy level. Electrons occupy the outermost shell possible, which determines the chemical reactivity of an atom.


Electrons are negatively charged particles that orbit around the nucleus of an atom in specific shells. The number of electrons in the outermost shell, also known as the valence shell, determines the chemical properties of an atom. Francium, a highly reactive metal, has one electron in its outermost shell, which can easily be transferred to another atom.

Neutrons and Protons

Neutrons and protons are two subatomic particles that reside within the nucleus of an atom. The number of protons in the nucleus is called the atomic number and determines the identity of the element. For example, an atom with six protons is carbon, while an atom with eight protons is oxygen.


Isotopes are atoms that have the same number of protons but different numbers of neutrons. This variance in neutron number can change the physical and chemical properties of the element. For example, carbon-12 has six neutrons, while carbon-14 has eight neutrons.


The number of neutrons in an atom can vary, even for atoms of the same element. These different isotopes of an element can behave differently in chemical reactions and have varying physical properties, such as melting point and density. However, isotopes with too many or too few neutrons are usually unstable and can undergo radioactive decay.


The number of protons in an atom determines the identity of the element. The number of protons also determines the charge of the nucleus, which in turn affects how the electrons interact with the atom. The number of protons in an atom can also influence the reactivity of an element.

Electron Shells

Electrons are found outside of the nucleus in specific shells, each with its own energy level. The outermost shell, known as the valence shell, is responsible for the chemical properties of an atom. The valence shell is the most significant factor in determining how an atom will interact with other atoms to form chemical bonds.

Energy Levels

Electrons occupy the energy levels or shells of an atom depending on their energy. The shell closest to the nucleus has the lowest energy level and can only hold up to two electrons. The second shell can hold up to eight electrons, while the third shell can hold up to eighteen electrons.

Valence Electrons

Valence electrons are the electrons found in the outermost shell of an atom. These electrons are responsible for the chemical properties of the element and determine how it can react with other atoms. For example, an atom with one valence electron, such as Francium, can readily lose this electron and form a positive ion.

Properties of Francium

Francium is the heaviest known member of the alkali metal group and a highly unstable radioactive element. It has a short half-life, with the most stable isotope, francium-223, lasting only 22.3 minutes.

Chemical Properties

Francium is incredibly reactive and can react explosively with water, acids, and other materials at room temperature. This element has an electronegativity value of 0.7, making it the least electronegative element on the periodic table. Due to its high reactivity, Francium does not have any commercial applications.

Physical Properties

Francium has a melting point of 27°C (81°F) and a boiling point of 677°C (1,251°F). It is a soft, silvery metal, similar in appearance to other metals in the alkali metal group. Francium has a density of 2.48 g/cm3, making it the second-lowest density metal directly after lithium.

Medical Applications

The use of atomic energy has revolutionized the medical field, allowing for accurate diagnosis and treatment options. Medical imaging techniques such as x-rays, computed tomography (CT), and magnetic resonance imaging (MRI) rely on atomic energy to function.

Cancer Treatment

Radiation therapy is a commonly used treatment option for cancer patients. It involves using high-energy radiation to kill cancer cells while sparing the healthy tissue surrounding the tumor. Atomic energy is used in radiation therapy to generate the high-energy radiation needed to treat cancer.

Medical Imaging

Medical imaging allows healthcare professionals to determine the location and severity of medical conditions and injuries. X-rays, CT scans, and MRIs all rely on atomic energy to produce images of the body’s internal structures. X-rays use ionizing radiation to create images, while CT scans use multiple x-rays and computer algorithms to generate detailed cross-sectional images. MRI uses powerful magnets to manipulate atomic nuclei, creating images with excellent contrast and resolution.

Nuclear Energy

Nuclear energy is a highly efficient and reliable energy source. It has two applications: nuclear power generation and nuclear weapons.

Nuclear Reactors

Nuclear reactors use atomic energy to generate electricity. The process involves using the heat produced by nuclear fission to generate steam that rotates turbines, producing electricity. Nuclear power plants provide a significant amount of electricity in many countries worldwide.

Nuclear Weapons

Atomic energy has also been used for destructive purposes, such as in nuclear weapons. The first atomic bomb, developed during World War II, resulted in catastrophic destruction in Hiroshima and Nagasaki, Japan. Since then, international efforts have been made to prevent nuclear weapons from being used in warfare.

Energy Generation

The use of atomic energy for energy generation has many benefits, such as producing a reliable and sustainable source of power with low carbon emissions. Nuclear power plants operate continuously, producing large amounts of electricity with a small footprint compared to other power plants. These plants also have a lower risk of catastrophic accidents due to the use of advanced safety protocols. On the other hand, the use of nuclear energy also presents certain risks, such as the production of radioactive waste that can remain hazardous for thousands of years. The security risks associated with nuclear power plants and the potential for natural disasters also pose significant challenges.


The use of atomic energy has revolutionized numerous fields, from medical imaging and cancer treatment to energy generation. While it presents many advantages, it also comes with significant risks and ethical considerations. As research continues, we can expect to discover new applications and uses for the power of atomic energy while taking measures to mitigate risks and ensure safety. In this article, we explored the fundamentals of atomic structure, the Francium Bohr model, and the characteristics of atoms, along with their applications and uses in medical and nuclear fields.


  1. What is atomic structure? Atomic structure refers to the composition of atoms, which are composed of a nucleus, containing protons and neutrons, and electron shells.
  2. What is the Francium Bohr model? The Francium Bohr model is a representation of the atom created by Niels Bohr, depicting the nucleus with protons and neutrons, and electron shells surrounding the atom’s nucleus.
  3. What are the applications of atomic energy in the medical field? Atomic energy is integral in medical imaging techniques like x-rays, MRI, and CT scans, and radiation therapy for treating cancer patients.
  4. What are the uses of atomic energy in nuclear energy? Atomic energy is used in nuclear power generation and the creation of nuclear weapons.
  5. What are the risks associated with atomic energy? The production of radioactive waste and potential security risks are some of the risks associated with atomic energy.

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