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Atomic Theory

Neutron a 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.
Electron a stable subatomic particle with a charge of negative electricity, found in all atoms and acting as the primary carrier of electricity in solids.
Proton a 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.
Element each of more than one hundred substances that cannot be chemically interconverted or broken down into simpler substances and are primary constituents of matter.
Atom the basic unit of a chemical element.
Malleable able to be hammered or pressed permanently out of shape without breaking or cracking.
Density the degree of compactness of a substance
Corrosive a corrosive substance
Ductile able to be drawn out into a thin wire.
Alkali Metals any of the elements lithium, sodium, potassium, rubidium, cesium, and francium, occupying Group IA (1) of the periodic table. They are very reactive, electropositive, monovalent metals forming strongly alkaline hydroxides.
Nobel gasses any 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.
Transitional Metals any of the set of metallic elements occupying a central block
Halogens any of the elements fluorine, chlorine, bromine, iodine, and astatine, occupying group VIIA (17) of the periodic table. They are reactive nonmetallic elements that form strongly acidic compounds with hydrogen, from which simple salts can be made.
Alkaline Earth Metals They are reactive, electropositive, divalent metals, and form basic oxides that react with water to form comparatively insoluble hydroxides.
Created by: Jacky13