Question

Write the following laws:

a) Newland’s law of octaves

b) Modern periodic law​

Answer 1

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Explanation:  Newland’s law of octaves

Law of octaves, in chemistry, the generalization made by the English chemist J.A.R. Newlands in 1865 that, if the chemical elements are arranged according to increasing atomic weight, those with similar physical and chemical properties occur after each interval of seven elements.

                          Modern periodic law​

                The modern periodic law states that the properties of the elements are a periodic function of their atomic numbers. ... The vertical columns of the periodic table are called the groups and the elements of the same group share similar properties. The horizontal rows are called the periods.                

Answer 2

Newland's Law of Octaves

It states that every 8th element has similar properties when the elements are arranged in the increasing order of their atomic masses. They compared the similarities between the elements to the octaves of music, where every 8th note is comparable to the first.

Modern Periodic Law

It states that the physical and chemical properties of elements are the periodic functions of their atomic number. The atomic number is equal to the number of electrons or protons in a neutral atom. There are 18 groups and 7 periods present in the modern periodic table.

[It is the modification of mendeleev's periodic table]