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Are about 100 different elements from which all subsatances are made.

Atoms are represented by chemical symbols.

Elements in a periodic table are arranged in coloumns,the elements in a group usually have simiolar properties.

Atoms have a nucleus surrounded by electrons.

Compounds are formed when two or more elements combine together.

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1.1

Are 100 different elements from which all substances are made.

Elements in the periodic table are in columns called groups,elements in a group usually have similar properties.

Atoms have a nucleus surrrounded by electrons.

Compounds are formed when twq or more elements combine together.

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