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Back in 1933, John Drury Clark published 1 his "race track" periodic table that subsequently became famous as the cover of Life magazine in 1949: Looks like B and Al are nicely positioned. Just need to add an outer track for elements 105 - 118, element names and symbols for elements 97 - 103 and element 41 is niobium, Nb. 1 Clark, John D. (November 1933). "...


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No that's wronge. the first one is right which is called ground state for an atom. 2s2 must be filled first becouse from hybridization concept we know that S-sub shell is more closer to the nucleus then thw P-sub shell and thus will have lower energy, so 1s2 2s2 2p1 is the right configuration for Boron, in this case neither Aufbau rules are voilated nor ...


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