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4d5 5s1 is where electron configurations of outer sublevels is the most stable. <span>this could be a tricky question because of the fact the respond is going against the final rule that could say that 4d4 5s2 is the main sturdy. the final 2 a merely nonsence there is not any such factor as s3 or s4</span>
I cant see what your asking
To disprove something
you have to have a....
1)hypothesis/observed
2)facts
3)experiment
that is all part of the scientific theory <span />
Look at the periodic table (Boron has 3) and count up from there
