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An electron in an outer shell of an atom that can be lost to or shared with another atom to form a molecule.

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A stable subatomic particle occurring in all atomic nuclei with a positive electric charge.

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A numeric scale used to specify the acidity or basicity of an aqueous solution.

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One of the horizontal rows in the periodic table, all of whose elements have the same number of electron shells.

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The positively charged central core of an atom, consisting of protons and neutrons and containing nearly all its mass.

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A subatomic particle of about the same mass as a proton but without an electric charge.

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A group of atoms bonded together.

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The Law of Conservation of Mass states that in any closed system the amount of mass will remain constant over time meaning that matter can neither be created nor destroyed.

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Was an English physicist and Nobel laureate in physics, credited with the discovery and identification of the electron.

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A New Zealand-born British physicist who came to be known as the father of nuclear physics. Discovered nucleus of the atom.

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An English chemist, physicist, and meteorologist. He is best known for his pioneering work in the development of modern atomic theory.

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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.

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Having a valence of three or more.

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Consisting of many atoms.

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Of, relating to, or consisting of molecules.

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(of a chemical bond) formed by the electrostatic attraction of oppositely charged ions.

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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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A set of elements occupying a column in the periodic table and having broadly similar properties arising from their similar electronic structure

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(of a reaction or process) accompanied by the release of heat.

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(of a reaction or process) accompanied by or requiring the absorption of heat.

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An electron shell or a principal energy level thought of as an orbit followed by electrons around an atom's nucleus.

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Each of more than one hundred substances that cannot be chemically interconverted or broken down into simpler substances and are primary constituents of matter.

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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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A substance formed from two or more elements chemically united in fixed proportions.

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A substance capable of reacting with an acid to form a salt and water, or  accepting or neutralizing hydrogen ions.

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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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A chemical substance that neutralizes alkalis, dissolves some metals, and turns litmus red; typically, a corrosive or sour-tasting liquid of this kind.