Question Text
Question 2 :
Compare the radii of two species X and Y.<br/>(a) X has 12 protons and 12 electrons.<br/>(b) Y has 12 protons and 10 electrons.<br/>
Question 6 :
Which of the following element belongs to the group 1 ?
Question 7 :
Which of the following is a correct statement about metallic atoms?
Question 11 :
Atomic radius of which element has the least value in $2^{nd}$ period ?<br/>
Question 12 :
The third period contains elements. Out of these elements, how many elements are non-metals? <br/>
Question 17 :
Atomic radii of Flourine and Neon in Angstorm units are given by?
Question 18 :
An element which is an essential constituent of all organic compounds belongs to:
Question 20 :
Group 18 of the periodic table is known by the name as :
