Barium Electron Configuration Long Form

Electronic configuration for barium


Barium is a chemical element with the atomic number 56 and symbol Ba. It belongs to the group of alkaline earth metals and is a soft, silvery-white metal. The electron configuration of barium is an essential concept in chemistry, and it plays a crucial role in understanding the chemical properties of this element.

What is Electron Configuration?

Electron configuration refers to the distribution of electrons in the energy levels of an atom. It is a way to describe how these electrons are arranged around the nucleus of an atom. The electron configuration of an atom determines its chemical behavior, including its reactivity and bonding properties.

Long Form Electron Configuration of Barium

The long form electron configuration of barium is 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 6s2. This configuration shows that barium has six energy levels, and each level is filled with electrons. The first energy level has two electrons, the second and third levels have eight electrons each, the fourth and fifth levels have 18 electrons each, and the sixth level has two electrons.

Explanation of Long Form Electron Configuration

The long form electron configuration of barium can be explained by using the Aufbau principle, Hund’s rule, and the Pauli exclusion principle. The Aufbau principle states that electrons fill the lowest energy levels first, followed by higher energy levels. Hund’s rule states that electrons fill orbitals singly before pairing up. The Pauli exclusion principle states that no two electrons in an atom can have the same set of quantum numbers.

Importance of Electron Configuration

The electron configuration of an atom is crucial in determining its chemical properties. It determines the number of valence electrons that an atom has and how it will bond with other atoms. For example, barium has a valence electron configuration of 6s2, meaning it has two valence electrons. This configuration makes barium highly reactive and able to form compounds with other elements.

Barium’s Chemical Properties

Barium is a highly reactive element and readily reacts with other elements to form compounds. It reacts with water to form barium hydroxide and hydrogen gas. It also reacts with halogens to form barium halides. Barium is used in various applications, including the manufacture of vacuum tubes, fireworks, and drilling muds.

Barium’s Physical Properties

Barium is a soft, silvery-white metal with a melting point of 727°C and a boiling point of 1897°C. It is a good conductor of electricity and has a density of 3.51 g/cm³. Barium is also highly malleable and ductile, meaning it can be easily shaped into different forms.

Barium’s Health Hazards

Barium is a toxic element and can be harmful to human health. Ingestion of barium can cause vomiting, diarrhea, and abdominal cramps. It can also cause muscle weakness, tremors, and paralysis. Long-term exposure to barium can lead to kidney damage and other health problems.


The long form electron configuration of barium is an essential concept in chemistry. It helps us understand the chemical properties of this element and how it reacts with other elements. Barium is a highly reactive element with both physical and health hazards, and we should handle it with care.