List of top Science Questions on Periodic Classification of Elements

What do you understand by short and long periods of periodic table ?
How many periods are there in the periodic table ?
Magnesium is a member of which group of the periodic table ?
Which was a defect of Mendeleev's periodic table ?
Who among the following propounded the laws of octave ?
Which of the following compounds would be the most basic ?
Silicon is a/an
Which is a non-metal in the following?
What is the number of elements in the third group of the periodic table?
The valency of all elements in a group of the periodic table is:
The atomic number of gold is:
On moving from right to left across the period of the modern periodic table, the atomic size:
The atomic number of sodium is:
The atomic number of magnesium is 12. What is its valency?
A metal and a non-metal that exists in liquid state at the room temperature are respectively :
The atomic number of sodium is:
On moving from right to left across the period of the modern periodic table, the atomic size:
What is the number of elements in the third group of the periodic table?
The valency of all elements in a group of the periodic table is:
The atomic number of gold is:
Boron and aluminium belong to which group of elements in periodic table?
The atomic number of potassium is 19. What is the valency?
What is the atomic number of fluorine?
Arsenic element is:
Write the atomic number and valency of the following elements:
(i) Oxygen
(ii) Potassium