Question 1 :
In which of the following period a maximum&#160;number of $32$ elements are present?<br/>

Question 2 :
The classification of elements in the&#160;modern periodic table is based on their:<br/>

Question 3 :
X, Y and Z are three elements in the third period.<br>$\bullet$ X reacts with chlorine to give a liquid product.<br>$\bullet$ Y reacts with chlorine to give a solid product that dissolves in water to give a solution of pH $7$.<br>$\bullet$ Z reacts with chlorine to give a solid product that dissolves in water to give a solution of pH $6$.<br>Which elements are good conductors of electricity?<br>

Question 4 :
The early attempt to classify elements as metals and non-metals was made by :

Question 5 :
Which of the following element belongs to the group 1 ?

Question 9 :
Which of the following statement about Mendeleev's periodic table is incorrect?

Question 10 :
The tendency of a bonded atom in a molecule to lose or repel the electron density of a shared pair of electrons is called:<br/>

Question 13 :
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 14 :
The distance between the centre of a nucleus and the outermost orbit of the atoms is called__________.

Question 15 :
The family of elements having seven electrons in the valence shell is :

Question 19 :
On moving from left to right across a period in the table, the metallic character :<br/>

Question 24 :
The elements with atomic numbers $9, 17, 35, 53, 85$ are all :

Question 26 :
Assertion: The placement of isotopes in Mendeleev's periodic table overcome in the modern periodic table. Reason: In modern periodic table, the elements have been allotted places based on their atomic numbers

Question 28 :
The name given by Newlands to the arrangement created by him was :

Question 30 :
Refer to changes in properties of elements&#160;&#160;on moving left to right across a period of the periodic table.For each property , choose the letter corresponding to the correct answer from A,B,C and D.<br/>Atomic Size :

Question 32 :
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 33 :
What is the name for the horizontal rows of the periodic table?

Question 35 :
The most significant contribution towards the&#160;development of periodic table was made by:<br/>

Question 36 :
Out of the elements with atomic numbers givenbelow which one would be a halogen?<br>

Question 39 :
Which of the following triads does not follow Dobereiner's law of triads?

Question 41 :
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 42 :
The law used by Newlands to arrange&#160;elements is known as&#160;Newlands Law of Octave&#160;.<br/>

Question 45 :
The pair of atomic numbers belonging to the same group are:<br/>

Question 46 :
In Doberenier triads, the atomic weights of the elements in a triad are in increasing order.<br/>

Question 47 :
The zigzag line in the periodic table separates ....... from .............

Question 50 :
In Newland's classification, elements are arranged in an increasing order of their: