henmetal
3 state some characteristics of periodic table
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The elements in a period have consecutive atomic numbers. The vertical columns in periodic table are called Group. The elements in a Group do not have consecutive atomic numbers. The metal lie on left side of metalloid and non metal lie on right side of metalloid.
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Mendeleev arranged the elements in horizontal rows (known as periods) in the increasing order of their atomic masses. Each vertical column (called groups) contained elements of similar properties. The main features of Mendeleev's periodic table are: Groups and sub-groups: There are eight groups (I to VIII).
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