Chemistry
What are noble gases. Give a reason why noble gases have stable electronic configuration.
Answer
Noble gases have stable electronic configuration i.e., their valence shell is complete. They do not gain, lose or share electrons. Their atoms are extremely unreactive.
For an atom to achieve stable electronic configuration, it must have:
- Two electrons in the first shell (outermost) like that of noble gas Helium. This is termed the Duplet Rule.
- Eight electrons in the outermost shell like that of noble gases other than Helium. This is termed the Octet Rule.
The octet and duplet arrangement of elements represents stability and hence noble gases have stable electronic configuration.
Related Questions
Explain the reason for chemical activity of an atom with reference to it's electronic configuration.
Draw the geometric atomic structure of the three isotopes of hydrogen and the two isotopes of chlorine.
Four elements A, B, C, D are given :
A shows the presence of 20 neutrons, 17 protons and 17 electrons.
B shows the presence of 18 neutrons, 17 protons and 17 electrons.
C shows the presence of 10 neutrons, 9 protons and 10 electrons.
D shows the presence of 4 neutrons, 3 protons and 2 electrons.
State which of the above is —
(a) an anion
(b) a cation
(c) a pair of isotopes.
Write the formula of the compound formed between D and C.
Differentiate between the terms —
Stable and unstable electronic configuration