Question Text
Question 2 :
Which of the following statement about Mendeleev's periodic table is incorrect?
Question 3 :
The most significant contribution towards the development of periodic table was made by:<br/>
Question 4 :
An element which is a soft and reactive metal is :<br/>
Question 5 :
Which of the following element belongs to the group 1 ?
Question 6 :
The groups from $1^{st}$ to $7^{th}$ of Mendeleev's periodic table were divided into ______ subgroups.
Question 10 :
The three elements A, B and C with similar properties have atomic masses X, Y and Z respectively. The mass of Y is approximately equal to the average mass of X and Z. Such an arrangement of elements called as :<br/>
Question 11 :
A nuclide having one proton and one neutron is represented as$_{ 1 }^{ 1 }{ H }$.
Question 13 :
The metal which does not give amphoteric oxide in the solution?
Question 14 :
Electronic configuration of element T is 2, 8, 7.<br/>What is the group number of T ?
