Concept explainers
Interpretation:
The electronic configurations of the given elements are to be drawn and the valence electrons are to be indicated.
Concept Introduction:
As per
The arrangement of electrons in orbits is termed as the electronic configuration. Atoms in which the orbits are completely filled are the least chemically reactive while those in which orbits are incomplete are reactive.
The electrons present in the outermost orbit in the electronic configuration are called valence electrons. The outermost orbit is termed as valence orbit.

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Chapter 3 Solutions
Bundle: Chemistry In Focus: A Molecular View Of Our World, 7th + Owlv2 With Mindtap Reader, 1 Term (6 Months) Printed Access Card
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