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Feb 26, 2014

#### write the similarities between dobereiner's triads and newland's law of octaves?write the change in modern periodic table as we go from left to right and top to bottom in context to -(1)valency electrons(2)valency(3)electronegativity (4)metallic character(5)electron affinity(6)atomic sizealso explain how?



Uses:
�i) � Atomic weights of elements were determined with the help of periodic table
Atomic weight = Valency ´ Equivalent weight = Group number ´ Equivalent weight.
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Mar 1, 2015



Dec 11, 2014



Dec 29, 2014



Jan 24, 2014

#### What are the limitations of modern periodic table



The limitations of modern periodic table are :-

i) It could not provide a proper plzcement of hydrogen....

ii) no place to isotopes of various elements is given....

Hope...

Feb 13, 2014



CH4,CO2,CFCs

Feb 12, 2015

#### why could no fixed position be given to hydrogen in Mandeleev's periodic table?



It is so because hydrogen has 1 valence electron in its outermost shell.so according to modern periodic table, hydrogen can be arranged in halogen family i.e. group no. 17 but hydrogen does not possess the prop...

Dec 27, 2014

#### What are the disadvantages of modren periodic table?



The disadvantages of modern periodic table are

Mar 9, 2015

#### How does the electronic configuration of an atom relate to its position in the modern periodic table?



To know its position in periodic table first we should know the electronic configuration ...