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1. Atoms are the building blocks of matter.
2. Each element has a chemical symbol.
3. Oxygen is used in oxy-acetylene flame for welding.
4. Noble gases are also called inert gases.
5. Dmitri Ivanovich Mendeleev arranged the element systematically in increasing atomic weight.
6. Elements are the simplest kind of matter.
7. Metals have high melting and boiling points.
8. As you move from left side of the periodic table to the right side, the elements become smaller and the atomic no.increases.
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