LIVE Course for free

Rated by 1 million+ students
Get app now
0 votes
500 views
in Chemistry by (54.1k points)
closed by

Why do helium, neon, and argon have zero valencies?

1 Answer

+1 vote
by (58.2k points)
selected by
 
Best answer

(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.

Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ experts/mentors/students.

Categories

...