In section 3.3.2 we learned
that for the Representative elements the element's group number is also the
number of valence electrons for those elements in that group.
Group IA elements all have 1
valence electron
Group IIA elements all have 2
valence electrons
Group IIIA elements all have 3
valence electrons
Group IVA elements all have 4
valence electrons
Group VA elements all have 5
valence electrons
Group VIA elements all have 6
valence electrons
Group VIIA elements all have 7
valence electrons
Group VIIIA elements all have 8
valence electrons
In section 4.4
we learned that metals have a tendency to lose their valence
electrons to form cations.
In section 4.5 we learned that when
an ion
is formed, the number of electrons that is gained or lost is determined by
the octet
rule.
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