Q3 of 149 Page 210

Which noble gas has less than 8 electrons in the valence shell of its atom? What is this number?

The noble gas which has less than 8 electrons in the valence shell of its atom is helium. The atomic no. of helium is 2.


More from this chapter

All 149 →
1

The total number of electrons in a nitrogen atom is 7. Find the number of valence electrons in it.

 2

What is the general name of the elements having 8 electrons in the valence shell of their atoms?

 4

State one use of radioactive isotopes in medicine.

 5

Give one example of a radioactive isotope which is used as a fuel in the reactors of nuclear power plants.