Two hundred and five is word notation. 205 is number notation.
9,080,000 in Scientific Notation = 9.08 x 106
2s2-s-15 = (2s+5)(s-3)
do u mean scientific notation? in scientific notation, the answer is 5.6x10-4
If you mean 70,000 then it is 7.0*10^4 in scientific notation
[He] 2s2 2p2
[He] 2s2
1s2 + 2s2 + 2p6 + 3s2 + 3p4 = sulfur's orbital notation
[He] 2s2 2p4
[He] 2s2 2p2 (the 2's to the right of each letter mean squared)
[He] 2s2 2p6
[He] 2s2 2p3
1s2 2s2
1s2 2s2 2p6 3s2 3p6 4s2 3d6 That is for an iron atom. If you mean an Fe+3 ion 1s2 2s2 2p6 3s2 3p6 3d5
[He] 2s2 2p2
[He] 2s2 2p2
[He] 2s2 2p6 for O2-