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Answer 1

Answer:

1)))))

The major limitations of Newlands' law of octaves were : (i) It was applicable to only lighter elements having atomic masses upto 40 u, i.e., upto calcium. ... (ii) It was assumed that only 63 elements existed in nature and no new elements would be discovered in the future.

2)))))) the law that the properties of the elements are periodic functions of their atomic numbers. Also called Mendeleev's law. (originally) the statement that the chemical and physical properties of the elements recur periodically when the elements are arranged in the order of their atomic weights.