Question 1 :
The elements having more masses were placed before elements having lower masses in Mendleev's periodic table. Guess the pair of elements (higher mass, lower mass).
Question 2 :
How did Mendeleev predict the existence of some yet to be discovered elements in his periodic table?<br/>
Question 4 :
Which of the following statement about Mendeleev's periodic table is incorrect?
Question 7 :
The groups from $1^{st}$ to $7^{th}$ of Mendeleev's periodic table were divided into ______ subgroups.
Question 8 :
Mendeleev used a Sanskrit numeral before the names of the predicted elements. What was the term used for it?
Question 9 :
Isotopes could find a position in Mendeleev's periodic table.<br/>State whether the given statement is true or false.<br/>
Question 10 :
The first attempt to classify elements systemically was made by :
Question 12 :
The placement of elements in the Newlands' table was compared to :
Question 13 :
In Mendeleev's periodic table, the elements were arranged in the increasing order of their atomic masses. However, cobalt with atomic mass of 58.93 amu was placed before nickel having an atomic mass of  58.69 amu. Reason for the same is that :
Question 15 :
The law used by Newlands to arrange elements is known as Newlands Law of Octave .<br/>
Question 16 :
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 17 :
The name given by Newlands to the arrangement created by him was :
Question 19 :
Which of the following triads does not follow Dobereiner's law of triads?
Question 22 :
Which of the following sets of atomic masses do not correspond to Dobereiner's triad?<br/>
Question 23 :
The eight group of Mendeleev's periodic table is divided into how many subgroups?
Question 24 :
In Newlands' table, which of the following elements was not placed in the same group in which cobalt and nickel were present?
Question 25 :
The number of elements known in Mendeleev's presented periodic table is:<br/>
Question 29 :
Whose name is not associated with the development of periodic Table
Question 30 :
Which periods were not divided into two series in the Mendeleev's periodic table?
Question 31 :
Statement: In Dobernier classification of elements, the atomic weight of the middle element is equal to the average of the extreme elements of a triad.<br/><br/>State whether the given statement is true or false.
Question 32 :
The sum of the number of elements of fifth and sixth period is :
Question 33 :
The alkali metals are in which group of the periodic table?<br>
Question 34 :
In Newland's classification, elements are arranged in an increasing order of their:
Question 35 :
The attempt for classifying elements by plotting the atomic masses of elements against the atomic volumes was made by:
Question 36 :
Assertion: The Newland's law of octaves fail.
Reason: The properties of elements beyond atomic weight 40 cannot be explained.
Question 38 :
The element placed with cerium, in the table formed by Newlands' was :
Question 39 :
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 41 :
Which of the following is the correct set of elements to Dobereiner's triads ?
Question 44 :
If the two members of a Dobereiner's triad are chlorine and iodine, then the third member of this triad is :<br/>
Question 45 :
Two elements were elected by Mendeleev for studying the properties of compounds formed by other elements with the selected elements. What were the selected elements?
Question 47 :
The most significant contribution towards the development of periodic table was made by:<br/>
Question 48 :
The atomic number of an element x is 12. The element left to it and right to it in same period of periodic table are :
Question 49 :
Cl, Br, I  follows Dobereiner's triads, the atomic masses of Cl and I are 35.5 and 127 respectively. The atomic mass of Br is : <br/>
Question 50 :
Numbering of groups as 1, 2, ........... 18 was adopted by IUPAC in :
