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Elements that  do not react and combine with other elements are called noble /inert elements.

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Elements can be further classified into:

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Elements can be further classified into:

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1. Metals 2. Non metals
3. Metalloids 4. Noble /Inert gases

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Two or more atoms combine together to form a molecule.

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An atom is the smallest structural unit of an element,

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When two or more pure substances are mixed together in any ratio , mixtures are formed.
Mixtures can be clsaaified into two types:
Homogeneous and Heterogeneous

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Compounds are formed when two or more elements are combined together in  a fixed ratio.

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There are 118 elements found in nature. They are arranged in a periodic table.

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periodic table of elements with names - Google Search

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periodic table of elements with names and symbols and atomic mass and atomic number

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Pure substances and mixtures