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 Mendel233ev organized the elements into a chart that is known as the Periodic Table of Elements.
Grades: Grade 4, Grade 5, Grade 6, Grade 7, Grade 8
Difficulty: Intermediate, Middle School
Pages: 17 pages
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