Question

Which of these elements is a noble gas? hydrogen (H) barium (Ba) nitrogen (N) krypton (Kr) bromine (Br)

Answer 1

Krypton...it is based off of its location on the periodic table

Answer 2

Answer : The correct option is krypton (Kr).

Explanation :

Noble gas : It is a group which is present at last in the periodic table and they belongs to group 18.

The general electronic configuration of noble gas is $(ns^2np^6)$.

The noble gas contains six elements which are helium, neon, argon, krypton, xenon and radon.

According to the question,

• Hydrogen belongs to group 1 which is a alkali metal.

The general electronic configuration of hydrogen is $(ns^1)$.

• Barium belongs to group 2 which is an alkaline earth metal.

The general electronic configuration of barium is $(ns^2)$.

• Nitrogen belongs to group 15 which is a non-metal.

The general electronic configuration of nitrogen is $(ns^2np^3)$.

• Bromine belongs to group 17 which is a halogen.

The general electronic configuration of bromine is $(ns^2np^5)$.

• Krypton belongs to group 18 which is a noble gas.

The general electronic configuration of krypton is $(ns^2np^6)$.

Therefore, the correct answer is krypton (Kr).