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The number of electrons in the outermost shell.
What is electron?
Electron is a subatomic particle with a negative electrical charge. In chemistry, electrons play a major role in chemical bonding and reactions. Electrons are found in the outermost shell of an atom and are responsible for the atom's chemical properties. Electrons can be transferred between two atoms, forming a bond and creating a molecule. Electrons also take part in chemical reactions, where they are either lost or gained. In this way, electron transfer is responsible for the formation of chemical compounds. Electron transfer is also responsible for the release of energy during chemical reactions; this energy can be used for a variety of purposes, such as powering electrical devices. Electrons are also responsible for the conductivity of metals, which allows them to be used in electrical circuits. Electrons in chemical reactions can also be used to break down complex molecules and to form new ones.
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