Chemistry, asked by devsam, 18 days ago

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Answered by pprincenirmaldass

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13) l signifies the secondary quantum number, whereas 'L' represents the second energy level (n=2) . It may be noted that the value of L is always same but that of l can change as 0 to (n-1).

14)The modern periodic law states that the physical and chemical properties of the elements are the periodic functions of their atomic numbers. Scientists arranged elements in increasing order of their atomic numbers from left to right across each row.

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