A138228 Atomic numbers at the top of the 18 groups of the Mendeleyev-Seaborg table A138724.
1, 4, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 5, 6, 7, 8, 9, 2
Offset: 0
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=========================================================== ........... THE PERIODIC TABLE OF THE ELEMENTS ............ =========================================================== P/G: 1A 2A 3B 4B 5B 6B 7B 8B 8B 8B 1B 2B 3A 4A 5A 6A 7A 8A =========================================================== (1): .1 .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .2 (2): .3 .4 .. .. .. .. .. .. .. .. .. .. .5 .6 .7 .8 .9 10 (3): 11 12 .. .. .. .. .. .. .. .. .. .. 13 14 15 16 17 18 (4): 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 (5): 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 ===========================================================
====================================================== ................... STRUCTURE OF .................... ........ THE PERIODIC TABLE OF THE ELEMENTS ......... ................... (50 columns) .................... ====================================================== 1) X................................................X 2) XX..........................................XXXXXX 3) XX..........................................XXXXXX 4) XXX................................XXXXXXXXXXXXXXX 5) XXX................................XXXXXXXXXXXXXXX 6) XXXX..................XXXXXXXXXXXXXXXXXXXXXXXXXXXX 7) XXXX..................XXXXXXXXXXXXXXXXXXXXXXXXXXXX 8) XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX 9) XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX ======================================================
======================================================================== ............................ STRUCTURE OF ............................. ................. THE PERIODIC TABLE OF THE ELEMENTS .................. ............................ (72 columns) ............................. ======================================================================== X......................................................................X XX................................................................XXXXXX XX................................................................XXXXXX XXX......................................................XXXXXXXXXXXXXXX XXX......................................................XXXXXXXXXXXXXXX XXXX........................................XXXXXXXXXXXXXXXXXXXXXXXXXXXX XXXX........................................XXXXXXXXXXXXXXXXXXXXXXXXXXXX XXXXX......................XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX XXXXX......................XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX ========================================================================
Columns of The Periodic Table of the Elements: 1...2...3...4...5...6...7...8...9...10..11..12..13..14..15..16..17..18. A notation convention of the groups is 1A, 2A, 3B, 4B, 5B, 6B, 7B, 8B, 8B, 8B, 1B, 2B, 3A, 4A, 5A, 6A, 7A, 8A. Then the sequence of this entry is formed from the numeric characters: 1, 2, 3, 4, 5, 6, 7, 8, 8, 8, 1, 2, ... Note that the elements, of the 4th period, whose crystals are ferromagnetics (26=Fe=Iron, 27=Co=Cobalt and 28=Ni=Nickel) are in the group 8B.
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