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What Matter Is Made Of

Scientists have identified 112 protonelementspropertiesatomSelect your answer. The smallest unit of each of these pure substances that has its properties is an atomelectronneutronprotonSelect your answer. These units are made of smaller particles. The protoncompoundelectronneutronSelect your answer has a negative charge, the protonelectronpropertiesneutronSelect your answer has a positive charge, and the electronsymbolneutronprotonSelect your answer has no charge. Each substance is given a special electroncompoundsymboltableSelect your answer of one or two letters. A scientist named Dmitri Mendeleyev created a periodic elementsprotontableatomSelect your answer. He grouped the substances according to chemical electroncompoundpropertiesprotonSelect your answer. Two or more substances can combine chemically to form a new protonelectroncompoundneutronSelect your answer.