[CC Atom Calculator] Explained and shortened.

electrons = 102 -- change this number for a new element!
subs = {2,8,18,32}
-- Add more electron positions if our electrons fill the default ammount
if(electrons > 60)then
    for i = 1, math.ceil((electrons - 60) / 32) do
        subs[#subs+1] = 32
    end
end
-- do this while we have electrons still not placed.
while electrons > 0 do
    -- loop through the shells and try to fill them
    for i = 1, #subs do
        if(electrons >= subs[i])then
                print(subs[i])
                electrons = electrons - subs[i]
        else -- if the electrons doesnt fill the shell then,
           -- if we have less than or equal too 8 electrons left (max valence electrons)
           -- then place them all down.
            if(electrons <= 8 and electrons > 0)then
                print(electrons)
                electrons= 0
            end
            -- look backwards through the table and search through previous shells
            -- so electrons that didnt get a chance to get placed are now placed.
             for y = #subs, 1, -1  do
                if(electrons >= subs[y] and electrons > 0)then
                    print(subs[y])
                    electrons = electrons - subs[y]
                end
             end
             -- if the backwards loop couldnt find a place for some electrons then place the rest down.
             -- the backwards loop cannot fail, if it does then there is less than 2 electrons left.
             if(electrons > 0)then
                 print(electrons)
                 electrons = 0
             end
        end
    end
end