Chemistry, It is the science that studies and applies the structure, properties, combinations, interactions, and reactions of matter, Element, name given to pure substances that are composed of atoms of the same kind and cannot be separated into simpler and different substances by chemical means., Atom, the smallest particle of a chemical element that can exist., Acid, the name given to chemical substances with a pH of less than 7, with varying degrees of caustic - corrosive properties and a wide range of uses., protons, positive electrical charge, neutrons, no electrical charge, electrons, negative electrical charge, lot of hydrogen ions, acids, lot of hydroxide ions, bases, three part of atom, proton - neutron - electron..

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