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How do the atomic properties vary with a period ?

Variations in the atomic properties of elements in any period are discussed below. Atomic number: In a period, the elements are arranged in the order of increasing atomic number. The atomic number increases by one unit atomic each element from left to right in a period.

How do the atomic properties vary in a group ?

All elements in a group generally show the same valence. From the values given in the above table, the valence of the main group elements is either equal to the number of valence electrons or 8-number of valence electrons.

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