Q: What does the notation 2s2 mean?

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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

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[He] 2s2 2p2

[He] 2s2

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[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-