write merits and demerits of Newland law,Mendeleev law and morden periodic table.
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according to newlands law the properties of elements repeat like the Tunes in song
but this property was not valid for higher elements (elements after calcium)
according to Mendeleev's theory,
properties of elements are a periodic function of their atomic masses
but this theory was not applicable for the isotopes
also noble gas was not discovered at that time so some of the properties are not applicable to them also
position of hydrogen was in anomaly
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