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Subjects
Science CBSE
Class 10
Periodic classification of elements
Textbook questions
20.
Exercises XI
Exercise condition:
5
m.
1.
Three elements with filled outermost shell.
Three elements with filled outermost shell are:
i.
Hydrogen
Nitrogen
Oxygen
Argon
ii.
Oxygen
Nitrogen
Hydrogen
Helium
iii.
Neon
Oxygen
Nitrogen
Hydrogen
2.
In the Modern periodic table, which are the metals among the first ten elements?
In the modern periodic table,
Oxygen
Lithium
Nitrogen
Hydrogen
and
Oxygen
Beryllium
Nitrogen
Hydrogen
are the only metals among the first ten elements.
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