The group number, number of valence electrons and valency of an element with atomic number ...
The group number, number of valence electrons and valency of an element with atomic number math xmlns=http://www.w3.org/1998/Math/MathMLmn15/mn/math , respectively, are
(a) math xmlns=http://www.w3.org/1998/Math/MathMLmo /momn16/mnmo,/momo /momn5/mn/math and math xmlns=http://www.w3.org/1998/Math/MathMLmn2/mn/math
(b) math xmlns=http://www.w3.org/1998/Math/MathMLmn15/mnmo,/momo /momn5/mn/math and math xmlns=http://www.w3.org/1998/Math/MathMLmn3/mn/math
(c) math xmlns=http://www.w3.org/1998/Math/MathMLmo /momn16/mnmo,/momo /momn6/mn/math and math xmlns=http://www.w3.org/1998/Math/MathMLmn3/mn/math
(d) math xmlns=http://www.w3.org/1998/Math/MathMLmn15/mnmo,/momo /momn6/mn/math and math xmlns=http://www.w3.org/1998/Math/MathMLmn2/mn/math
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