define groups and periods
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the same property of element placed in a horizontal row called groups
periods means all elements kept in order of atomic number
periods means all elements kept in order of atomic number
lasya61:
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Group is a vertical row and periods is a horizontal row.
in Group the characteristics of element is same in periods characteristics of elements is different. Periods have in serial number I.e,1,2,3...
But in group there is not a serial number.
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