(a) Helium, Neon, and Argon are the examples of the special group of elements called the noble gases.
(b) This is because of their completely filled valence shell. All these elements have a valency of zero because of their fully filled outermost shells.
(c) Their atomic numbers are 2, 8 and 18 respectively, by their electronic configuration Helium has 2 electrons in the K shell, Neon has 8 in the L shell and Argon has 8 in the M shell.
(d) The K shell in the Helium is filled and the L and M shells in Neon and Argon respectively have a complete octet of electrons which makes them stable, so they do not require sharing their electrons and have the valency of zero.
Rate this question :
How an element isAll In One - Science
List two differenAll In One - Science
Why is electron kAll In One - Science
Why are anode rayAll In One - Science
What is the maximLakhmir Singh & Manjit Kaur - Chemistry
State whether theLakhmir Singh & Manjit Kaur - Chemistry
How does a protonLakhmir Singh & Manjit Kaur - Chemistry
Compare the propeEvergreen - Science
Three different aLakhmir Singh & Manjit Kaur - Chemistry
What is a neutronLakhmir Singh & Manjit Kaur - Chemistry