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Atomic Core – Definition and Significance

The atomic core refers to the part of an atom consisting of the nucleus and the inner electron shells that do not participate in chemical bonding.

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Things worth knowing about "Atomic Core"

The atomic core refers to the part of an atom consisting of the nucleus and the inner electron shells that do not participate in chemical bonding.

What Is the Atomic Core?

The atomic core (also called the atomic kernel or core electrons system) is a fundamental concept in atomic and quantum chemistry. It refers to the part of an atom that includes the atomic nucleus (protons and neutrons) together with the inner electron shells, which are fully occupied and do not directly participate in forming chemical bonds. Together with the valence electrons in the outermost shell, the atomic core makes up the complete atom.

Structure and Composition

An atom can be described in three main components:

Atomic nucleus: Contains positively charged protons and electrically neutral neutrons.
Inner electron shells (core electrons): These completely filled shells are tightly bound to the nucleus and are largely chemically inert. They form part of the atomic core.
Outer electron shell (valence shell): The valence electrons located here are chemically reactive and determine the chemical properties of the element. They are not part of the atomic core.

The atomic core carries an effective positive residual charge, which is calculated as the nuclear charge number (number of protons) minus the number of core electrons. This residual charge is called the core charge or effective nuclear charge, and it influences how strongly the valence electrons are attracted to the atom.

Importance in Chemistry

The concept of the atomic core is especially important for understanding chemical bonding and the reactivity of elements:

The core charge largely determines the ionization energy of an element -- that is, the energy required to remove an electron from the atom.
The higher the core charge, the more strongly the valence electrons are attracted, making them harder to remove.
Across a period of the periodic table, the core charge increases from left to right, which explains the increasing electronegativity and ionization energy observed.
Moving from one period to the next, the atomic core grows by one complete electron shell, which increases the atomic radius.

Relevance in Medicine and Biology

Although the atomic core is primarily a concept from chemistry and physics, it has indirect relevance in medicine and biochemistry:

Understanding electron configuration and core charge is essential for explaining how ions (e.g., sodium Na⁺, potassium K⁺, calcium Ca²⁺) are formed -- ions that perform vital functions in the human body.
The bonding properties of molecules, which are partly determined by the atomic core, are critical for the behavior of pharmaceutical drugs, enzymes, and biomolecules.
In radiation medicine and nuclear medicine, the nuclear structure of the atomic core plays a central role in understanding radioactive decay processes.

Distinction from Related Terms

It is important to clearly distinguish the atomic core from the following related terms:

Atomic nucleus: Only the innermost part of the atom containing protons and neutrons, without any electron shells.
Atom: The complete particle, consisting of the atomic core plus valence electrons.
Ion: An atom or group of atoms carrying an electric charge due to gaining or losing electrons.

References

Mortimer, C. E.; Mueller, U.: Chemistry - The Basic Knowledge of Chemistry. 12th edition. Georg Thieme Verlag, Stuttgart 2019.
Atkins, P.; de Paula, J.: Physical Chemistry. 10th edition. Oxford University Press, Oxford 2014.
Housecroft, C. E.; Sharpe, A. G.: Inorganic Chemistry. 5th edition. Pearson Education, Harlow 2018.

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