കാൽക്കോജൻ കുടുംബത്തിലുള്ള റേഡിയോ ആക്റ്റീവ് മൂലകം ഏത്?

ഏക അറ്റോമിക തന്മാത്രകളുള്ള മൂലകങ്ങളേവ ?

The primary substance used for vulcanizing rubber is

Helium gas is used in gas balloons instead of hydrogen gas because it is

Which of the following sublimes on heating?

Which element is used to kill germs in swimming pool?

Chlorine is used as a bleaching agent. The bleaching action is due to

Which is the king of poison?

Which substance is used for making pencil lead?

Which of the following element has the highest melting point?

The compound of boron having similar structure like benzene is

The element having maximum number of isotopes?

The atomic number for titanium is _________

The compound of potassium which is used for purifying water?

The element which is known as 'Chemical sun'

The most abundant element in the atmosphere is :

The most abundant element in the universe is:

The radioactive isotope of hydrogen is ___________.

The isotope used in carbon dating is

Isotope was discovered by

The element having no neutron in the nucleus of its atom :

What is the electronic configuration of an oxide ion O^2- ?

Which one of the following is not the electronic configuration of atom of a noble gas?

The electronic configuration of an atom an element with atomic number 8 is...

Identify the element which shows variable valency.

The term Element was coined by?

The element used to find Atomic mass unit?

The number of neutrons in an atom of Hydrogen is

The atomic number of carbon is 6 and its atomic mass is 12. How many are there protons in the nucleus of carbon?

What is the number of valence electrons of Aluminium?

How many valence electrons does an oxygen atom have

The elements having same atomic number but different mass numbers are called ______

The correct electronic configuration of sodium is:

Which isotope of hydrogen contains only one proton and no neutron in its nucleus?

How many electrons does the outermost shell of Neon have

Atomic mass of an element is equal to the sum of

Which of the following elements is commonly present in petroleum, fabrics and proteins?

What is the valency of carbon?

The basic element present in all organic compounds is

The element which is known as the enemy of copper is

Which element is known as king of poison?

The elements which is kept in water is

The method used to purify sulphide ores is

The element which has highest melting point

Element used to get orange flames in fire works?

Element having the name of Earth?

The radioactive Gaseous element?

Which one of the following elements is very rare?

Which of the following chemical elements has the highest electron affinity?

Aluminium would have similar properties to which of the following chemical elements?