Question 2 :
An element belongs to the 3rd period and Group II of the periodic table.<br/>Name of the element is ________.

Question 4 :
On moving from left to right across a period in the table, the metallic character :<br/>

Question 5 :
An element which is a soft and reactive metal is :<br/>

Question 6 :
The number of elements known in Mendeleev's presented periodic table is:<br/>

Question 7 :
The elements with atomic numbers $9, 17, 35, 53, 85$ are all :

Question 9 :
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 10 :
The long form of the periodic table consists of ___ horizontal rows and ___vertical columns.

Question 11 :
The elements $A, B, C, D\ and \ E $ have atomic number 9, 11,17,12 and 13, respectively. Which pair of elements belongs to the same group?

Question 14 :
The third period contains elements. Out of these elements, how many elements are non-metals?&#160;<br/>

Question 15 :
Which amongst the following element is present at the top of periodic table?

Question 16 :
The metal which does not give amphoteric oxide in the solution?

Question 17 :
<br/>Among the following metals, which one has the weakest metallic character?<br/>

Question 18 :
Element 'X' has twelve protons in its nucleus. To which group of the periodic table it will belong?

Question 19 :
An element $M$ has an atomic number 9 and atomic mass 19. Its negative ion will be represented by:

Question 22 :
Assertion: Atom with large atomic radii and low ionisation potential are more metallic in nature. Reason: Atom with large atomic radii and low ionisation potential have tendency to loose electron

Question 23 :
It is not possible to measure the atomic radius precisely since the electron cloud surrounding the atom does not have a sharp boundary. One practical approach to estimate the size of an atom of a non-metallic element is to measure the distance between two atoms when they are bound together by a single bond in a covalent molecule and then dividing by two. For metals, we define the term &#34;metallic radius&#34; which is taken as half the internuclear distance separating the metal cores in the metallic crystal. The van der Waal's radius represents the overall size of the atoms which includes its valence shell in a non bonded situation. It is the half of the distance between two similar atoms in separate molecules in a solid. The atomic radius decreases across a period and increases down the group. Generally, same trends are observed in case of ionic radius. The ionic radius of the species having the same number of electrons depends on the number of protons in their nuclei.<br/><br/>Which of the following statements is correct?

Question 24 :
Which of the following statement(s) is/are true about the modern form of periodic table?<br/>

Question 25 :
Assertion: According to Mendeleev, the properties of elements are a periodic function of their atomic weights. Reason: Mendeleev left the gap under aluminium and a gap under silicon, and called these elements Eka-Aluminium and Eka-Silicon.