NCERT Solution for Class 10 Science Chapter 5
Periodic Classification of Elements
NCERT Books for Session 2022-2023
CBSE Board and UP Board
Intext Questions
Page No-90
Questions No-4 Part 2
Helium is an unreactive gas and neon is a gas of extremely low reactivity. What, if anything, do their atoms have in common?
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Following properties are common in the atoms of Helium and Neon:
(i) Both have completely filled outermost orbit.
(ii) Both have stable electronic configuration.
(iii) Both belong to same group, i.e. zero group in Modern Periodic Table.
Both helium (He) and neon (Ne) have filled outermost shells. Helium has a duplet
in its K shell, while neon has an octet in its L shell.
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