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Anuj A

Mar 1, 2015



Ayushman

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.
...

Dilip Kumar

Dec 11, 2014



Ketan Ahuja

Dec 29, 2014

#### What are Dobereiner’s  triads?



In year 1817 a german scientist dobereiner suggested that properties of element are related to their atomic masses female groups of 3 elements each having similar chemical properties and call them triod

...

Gautam

Dec 27, 2014

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



The disadvantages of modern periodic table are

Rohit Jha

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...

Premwati Sharma

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...

Deepam

Feb 28, 2014

#### why are the elements of group 17 are known as halogens???



Group 17 elements are called halogens because halogen is a Greek word which means 'salt producing'. Halogens include fluorine, chlorine, bromine, iodine a...

Rohit Jha

Feb 13, 2014



CH4,CO2,CFCs

P Murali Krishna

May 1, 2015



Anuj A

Mar 1, 2015



Ayushman

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.
...

Dilip Kumar

Dec 11, 2014



Ketan Ahuja

Dec 29, 2014

#### What are Dobereiner’s  triads?



In year 1817 a german scientist dobereiner suggested that properties of element are related to their atomic masses female groups of 3 elements each having similar chemical properties and call them triod

...

Gautam

Dec 27, 2014

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



The disadvantages of modern periodic table are

Rohit Jha

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...

Premwati Sharma

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...

Deepam

Feb 28, 2014

#### why are the elements of group 17 are known as halogens???



Group 17 elements are called halogens because halogen is a Greek word which means 'salt producing'. Halogens include fluorine, chlorine, bromine, iodine a...

Rohit Jha

Feb 13, 2014



CH4,CO2,CFCs

P Murali Krishna

May 1, 2015