QUANTUM NUMBER

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QUANTUM NUMBER DEFINITION

A quantum number is a value that is used when describing the energy levels available to atoms and molecules. An electron in an atom or ion has four quantum numbers to describe its state and yield solutions to the Schrödinger wave equation for the hydrogen atom.
There are four quantum numbers:
n - principal quantum number - describes the energy level
ℓ - azimuthal or angular momentum quantum number - describes the subshell
mℓ or m - magnetic quantum number - describes the orbital of the subshell
ms or s - spin quantum number - describes the spin........read more

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STERIC NUMBER

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Steric number is the number of atoms bonded to a central atom of a molecule plus the number of lone pairs attached to the central atom. The steric number of a molecule is used in VSEPR (valence shell electron pair repulsion) theory to determine the molecular geometry of a molecule.......... read more
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Radioactive decay

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Radioactive decay Radioactive decay a the spontaneous process through which an unstable atomic nucleus breaks into smaller, more stable fragments. Have you ever wondered exactly  why  some nuclei decay, while others don't? It's basically a matter of thermodynamics. Every atom seeks to be as stable as possible. In t Radioactive decay occurs because an atom's atomic nucleus isn't stable, due to a mismatch in the numbers of protons and neutrons[/caption] he case of radioactive decay, instability occurs when there is an imbalance in the number of protons and neutrons in the atomic nucleus. Basically, there is too much energy inside the nucleus to hold all the nucleons together. The status of the electrons of an atom doesn't matter for decay, although they, too, have their own way of finding stability. If the nucleus of an atom is unstable, eventually it will break apart to lose at least some of the particles that make it unstable. The original nucleus i
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