Why Boron is in fifth place in the periodic table
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Answer:
Every elements of the periodic are arranged in the manner of atomic number and its valency,here boron is the fifth element-as counted by atomic number ,5 protons ,
6 neutrons,after H, He, Li, Be. Now Li & Be are in columns IA & 2A of the periodic table — and respectively show common ionic charges of +1 & +2. In fact Be often shows covalent bonding, with two electron-pair sharing compounds, so that these compounds are identified to valence +2 also. Boron (immediately after Be) then can be expected to show a valence of +3 (and Carbon after that, 4). I prefer the numbering scheme where B, C, N, O, F, Ne are assigned to columns 3A, 4A, 5A, 6A, 7A, 8A.
A sizeable group of people assign them to similarly numbered columns, but with a B alphabetic sub-label. There is a third fairly common numbering scheme where Li, Be, B, C, N, O, F, Ne are assigned respective numbers 1, 2, 13, 14, 15, 16, 17, 18 . In the first & second schemes the column numbers correspond to maximum valences — at least for some of the elements in these columns — the idea for this going back to Mendeleev. In all our periodic tables the elements are listed according to atomic number, and the columns contain elements of similar “character”.
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