What are the important features of the elements in a period?
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Elements are arranged in the increasing order of atomic numbers. Elements in the modern periodic table are arranged in 7 periods and 18 groups. Horizontal rows are called periods and vertical columns are called groups. Elements are placed in periods based on the number of shells in their atoms.
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What are the important characteristics of a period in periodic table? increases from one to eight (except first period where the increase is from one to two only.) (ii) Valency: The valency of elements increases from one to four, then decreases to one and becomes zero in the case of inert gases.
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