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Metallic bonds are formed from the attraction between mobile electrons and fixed, positively charged metallic atoms. Whereas most chemical bonds are localized between specific neighboring atoms, metallic bonds extend over the entire molecular structure.

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A group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction.

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Is a chemical bond that involves the sharing of electron pairs between atoms

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The symmetrical three-dimensional arrangement of atoms inside a crystal.

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An atom or molecule with a net electric charge due to the loss or gain of one or more electrons.

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Is the complete transfer of valence electron(s) between atoms. It is a type of chemical bond that generates two oppositely charged ions.

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Is an electron that is associated with an atom, and that can participate in the formation of a chemical bond; in a single covalent bond, both atoms in the bond contribute one valence electron in order to form a shared pair.

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A thing used to tie something or to fasten things together.

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A chemical bond is a lasting attraction between atoms that enables the formation of chemical compounds. Thebond may result from the electrostatic force of attraction between atoms with opposite charges, or through the sharing of electrons as in the covalent bonds.

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Are a group in the periodic table consisting of five chemically related elements: fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At).

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ny of the gaseous elements helium, neon, argon, krypton, xenon, and radon, occupying Group 0 (18) of the periodic table. They were long believed to be totally unreactive but compounds of xenon, krypton, and radon are now known.

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The mass of an atom of a chemical element expressed in atomic mass units. It is approximately equivalent to the number of protons and neutrons in the atom (the mass number) or to the average number allowing for the relative abundances of different isotopes.

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The total number of protons and neutrons in a nucleus.

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Each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei, and hence differ in relative atomic mass but not in chemical properties; in particular, a radioactive form of an element.

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The number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table.

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subatomic particle of about the same mass as a proton but without an electric charge, present in all atomic nuclei except those of ordinary hydrogen.

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A unit of mass used to express atomic and molecular weights, equal to one-twelfth of the mass of an atom of carbon-12. It is equal to approximately 1.66 x 10⁻²⁷ kg.

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stable subatomic particle occurring in all atomic nuclei, with a positive electric charge equal in magnitude to that of an electron, but of opposite sign.

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Is an informal term in physics. It is used to describe where electrons are when they go around the nucleus of an atom.

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he central and most important part of an object, movement, or group, forming the basis for its activity and growth.

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A stable subatomic particle with a charge of negative electricity, found in all atoms and acting as the primary carrier of electricity in solids.

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The basic unit of a chemical element.