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Chemistry Atomic structure class 11 and class 12

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According to the periodic table of elements the variation in properties of elements is related to their (A) valency

(B) nucleus mass

(C) atomic number

(D) atomic mass
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(C) atomic number

The Periodic Law states that the physical and chemical properties of the elements recur in a systematic and predictable way when the elements are arranged in order of increasing atomic number.

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