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Periodic Classification Of Elements Free Doubts and Solutions

CBSE - X - Chemistry - Periodic Classification of Elements

Then whether the size of noble gas is bigger than the alkali metals?

Asked by shiphalijain 13th March 2017, 5:38 PM
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CBSE - X - Chemistry - Periodic Classification of Elements

What is the number of elements in first,second and third period of the periodic table? Give reason for your answer.

Asked by paulineambooken 1st March 2016, 5:05 PM
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CBSE - X - Chemistry - Periodic Classification of Elements

How were the following defects in the original Mendeleev's Periodic Table resolved in the modified Mendeleev's Periodic Table?
(i) Problem of Anomalous Pairs
(ii) Position of Rare Earths
(iii) Position of Isotopes

Asked by vatsalchoudhary41 24th February 2016, 6:20 PM
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CBSE - X - Chemistry - Periodic Classification of Elements

A n element has mass no 40 and contains 21 electrons in its atom. In which group of periodic table does it belong?
 

Asked by ESHITA MUKHERJEE 3rd February 2016, 7:10 PM
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CBSE - X - Chemistry - Periodic Classification of Elements

it really helped me.. but i want to know that can we find valence electrons in elements with help of 2n^2 formula if yes then how?

Asked by vans75a 2nd January 2016, 7:46 PM
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CBSE - X - Chemistry - Periodic Classification of Elements

how to find valence electrons of an element 
plz tell with example of
tin krypton strontium and titanium

Asked by vans75a 1st January 2016, 6:02 PM
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CBSE - X - Chemistry - Periodic Classification of Elements

how to find valence electrons of an element 
plz tell with example of
tin krypton strontium and titanium

Asked by vans75a 1st January 2016, 6:01 PM
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CBSE - X - Chemistry - Periodic Classification of Elements

Explain  transitional elements in periodic table

Asked by bosesreyan 15th April 2015, 11:49 PM
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CBSE - X - Chemistry - Periodic Classification of Elements

I want to know Calcium has 2,8,8,2 whereas next element Scandium has 2,8,9,2.How is this possible,I couldn't understand.Please say with respect to Valency shells.

Asked by RAHUL rd 2nd March 2015, 12:00 PM
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CBSE - X - Chemistry - Periodic Classification of Elements

WHAT IS AN EAZY WAY TO REMEMBER THE PERIODIC TABLE ?

Asked by Mohit RaAz 18th January 2015, 9:16 PM
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