User talk:47.25.197.1

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I undid your edits to Block (periodic table) because the original text had the correctly written electron configuration. It may seem counterintuitive at first, but electron configurations do not include the symbol of the element. They instead use the preceding noble gas as shorthand for that element's electron configuration, and explicitly include the remaining energy levels after the noble gas configuration. For example, sodium (Na) is 1s2 2s2 2p6 3s1; notice that 3s1 is a new energy level above the configuration of neon, so it can be abbreviated to [Ne] 3s1.

If you have any further questions, feel free to ping me, or ask at the reference desk. Happy editing! ComplexRational (talk) 15:59, 5 November 2019 (UTC)