Question 2 :
The groups from $1^{st}$ to $7^{th}$ of Mendeleev's periodic table were divided into ______ subgroups.

Question 3 :
In Doberenier triads, the atomic weights of the elements in a triad are in increasing order.<br/>

Question 4 :
If the two members of a Dobereiner triad are phosphorus and antimony, the third member of this triad is&#160;:<br/>

Question 5 :
If X and Y are two elements which belong to same group of Newland's periodic table, how many elements exists between X and Y?

Question 6 :
In Newlands' table, which of the following elements was not placed in the same group in which cobalt and nickel were present?

Question 8 :
The element with atomic number $Z=115$ will be placed in :

Question 10 :
If scientist succeed in obtaining element with atomic number 114, which of the following&#160;well known element would you expect it to resemble?

Question 11 :
An atom has electronic configuration $1{ s }^{ 2 }\ 2{ s }^{ 2 }2{ p }^{ 6 }\ 3{ s }^{ 2 }3{ p }^{ 6 }3{ d }^{ 3 }\ 4{ s }^{ 2 }$. It will be place it in :

Question 12 :
In modern periodic table, if two elements have the same number of valence electrons, then they belong to the same&#160;:<br/>

Question 14 :
An element which is a soft and reactive metal is :<br/>

Question 15 :
The element with atomic number $14$ is hard and forms acidic oxide and a covalent halide. To which of the following categories does the element belong?

Question 17 :
The ground state electronic configurations of the elements, U, V, W, X and Y (these symbols do not haveany chemical significance) are as follows:<br>U $1s^2 2s^2 2p^3$ V $1s^2 2s^2 2p^6 3s^1$<br>W $1s^2 2s^2 2p^6 3 s^2 3p^2$ X $1 s^2 2s^2 2 p^6 3s^2 3p^6 3d^5 4s^2$<br>Y $1 s^2 2s^2 2p^6 3s^2 3p^6 3d^{10} 4s^2 4 p^6$<br>Determine which sequence of elements satisfy the following statements:<br>(i) Element forms a carbonate which is not decomposed by heating<br>(ii) Element is most likely to form coloured ionic compounds<br>(iii) Element has largest atomic radius<br>(iv) Element forms only acidic oxide

Question 19 :
The correct order for decreasing atomic radius of the five atoms $H,\ Br,\ I,\ He$ and $S$ is :

Question 20 :
The correct order for decreasing atomic radius of&#160;the five atoms H, Br, I, He and S is?<br/>

Question 21 :
On passing 0.5 F of electricity through molten sodium chloride, sodium deposited at cathode will be

Question 24 :
Considering the elements $B,C,N,F$ and $Si$, the correct order of their non metallic character is<span class="_wysihtml5-temp">&#160;: