Which element has the electron configuration of 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 5s2 5p6
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To determine what element has
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 + 10 + 2 + 6 + 10 + 2 + 6. That gives us a total of 54 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 54 electrons, we therefore have 54 protons, and the element with atomic number 54. We look up 54 on the periodic table and the element with the electron configuration of 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 5s2 5p6 is Xenon (Xe). This is the long form electron configuration for Xe. The abbreviated, or condensed notation is [Kr] 4d10 5s2 5p6
Helpful Videos:
• Introduction to Writing Electron Configurations: Introduction to Electron Configurations
• Electron Configurations Chart: Using the Electron Configuration Chart
• Writing Electron Configs Using only the Periodic Table: Writing Electron Configurations Using...
• Order of d and s Orbital Filling: https://eic.rsc.org/Coature/the-troub...
Sometimes we have ions, these aren’t 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.
For this element we have 2 + 2 + 6 + 2 + 6 + 10 + 2 + 6 + 10 + 2 + 6. That gives us a total of 54 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 54 electrons, we therefore have 54 protons, and the element with atomic number 54. We look up 54 on the periodic table and the element with the electron configuration of 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 5s2 5p6 is Xenon (Xe). This is the long form electron configuration for Xe. The abbreviated, or condensed notation is [Kr] 4d10 5s2 5p6
Helpful Videos:
• Introduction to Writing Electron Configurations: Introduction to Electron Configurations
• Electron Configurations Chart: Using the Electron Configuration Chart
• Writing Electron Configs Using only the Periodic Table: Writing Electron Configurations Using...
• Order of d and s Orbital Filling: https://eic.rsc.org/Coature/the-troub...
Sometimes we have ions, these aren’t 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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4 سال پیش
در تاریخ 1399/09/10 منتشر شده
است.
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