Which element has the electron configuration of 1s2 2s2 2p6 3s2 3p6 3d8 4s2

To determine what element has this electron configuration of we first count the electrons. Those are the small number placed at the top after the letters. For this element we have 2 2 6 2 6 8 2. That gives us a total of 28 electrons. In a neutral atom electrons will equal the number of protons. On the periodic table we can usually find the atomic number above the element symbol. This is the same as the number of protons. In a neutral atom electrons protons. Since we had 28 electrons we therefore have 28protons and the element with atomic number 28. We look up 28 on the periodic table and the element with the electron configuration of 1s2 2s2 2p6 3s2 3p6 3d8 4s2 is Nickel Ni. This is the long form electron configuration for Ni. The abbreviated or condensed notation is Ar 3d8 4s2 Helpful Videos: Introduction to Writing Electron Configurations: Electron Configurations Chart: Writing Electron Configs Using only the Periodic Table: Order of d and s Orbital Filling: Sometimes we have ions these arent neutral they have a charge. You can tell bc there will be a or sign in the superscript after the element symbol. Neutral Elements: for example Na Fe N O H. All the elements as listed on the Periodic Table are neutral. Ions: for example Na Fe 3 N 3- O 2- H . Ions are elements that have lost or gained electrons.,

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