|Product #: SED10581_TQ|
The World of Elements and Their Properties (Resource Book Only) eBookGrade 3|Grade 4
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There are 90 different elements, like the oxygen that we breathe, that can be found in nature. When two or more elements combine, they are held together by a chemical bond and form a compound. In 1869, chemist Dmitri Mendeléev organized the elements into a chart that is known as the Periodic Table of Elements.
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