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1. • Helium atom

     • The n = 1 shell is completely filled in a helium atom.
     Reference:

     3.4: Electronic Structure of Atoms (Electron Configurations)

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   What is an electron shell in chemistry?

   • In chemistry and atomic physics, an electron shell may be thought of as an orbit that electrons follow around an atom 's nucleus. The closest shell to the nucleus is called the "1 shell" (also called the "K shell"), followed by the "2 shell" (or "L shell"), then the "3 shell" (or "M shell"), and so on farther and farther from the nucleus.

   Electron shell - Wikipedia

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   How many electrons can a atom hold?

   • The first shell (of all atoms) has 1 subshell of s-orbitals containing 1 s orbital. This means that the first shell can hold 2 electrons. The second shell has 2 subshells: 1 s-orbital and 3 p-orbitals. This means that the second shell can hold 8 total electrons.

   The periodic table, electron shells, and orbitals - Khan Academy

   www.khanacademy.org/science/ap-chemistry-beta/x2eef969c74e0d802:atomic-structure-and-properties/x2eef969c74e0d802:atomic-structure-and-electron-configuration/a/the-periodic-table-electron-shells-and-orbitals-article

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   How many electrons occupy a n 1 2 shell?

   • The n = 1 shell is filled with two electrons and three electrons will occupy the n = 2 shell. Because any s subshell can contain only two electrons, the fifth electron must occupy the next energy level, which will be a 2 p orbital. There are three degenerate 2 p orbitals ( ml = −1, 0, +1) and the electron can occupy any one of these p orbitals.

   3.4: Electronic Structure of Atoms (Electron Configurations)

   chem.libretexts.org/Bookshelves/General_Chemistry/Chemistry_-_Atoms_First_1e_(OpenSTAX)/03:_Electronic_Structure_and_Periodic_Properties/3.4:_Electronic_Structure_of_Atoms_(Electron_Configurations)

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   Which two elements have only electrons in their first shell?

   • On the periodic table, hydrogen and helium are the only two elements in the first row, or period, which reflects that they only have electrons in their first shell. Hydrogen and helium are the only two elements that have electrons exclusively in the 1 s orbital in their neutral, non-charged, state.

   The periodic table, electron shells, and orbitals - Khan Academy

   www.khanacademy.org/science/ap-chemistry-beta/x2eef969c74e0d802:atomic-structure-and-properties/x2eef969c74e0d802:atomic-structure-and-electron-configuration/a/the-periodic-table-electron-shells-and-orbitals-article

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3. www.khanacademy.org › science › ap-chemistry-betaThe periodic table, electron shells, and orbitals - Khan Academy

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   The first shell (of all atoms) has 1 subshell of s-orbitals containing 1 s orbital. This means that the first shell can hold 2 electrons. The second shell has 2 subshells: 1 s-orbital and 3 p-orbitals. This means that the second shell can hold 8 total electrons. Every orbital is a shape (that can be determined by a trigonometric function I ...

4. chem.libretexts.org › Courses › South_Puget_Sound3.7: Electrons and Valence Shells - Chemistry LibreTexts

   chem.libretexts.org › Courses › South_Puget_Sound

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   Jul 20, 2023 · Hydrogen has one electron; therefore, it has only one spot within the 1s orbital occupied. This is designated as 1 s 1 , where the superscripted 1 refers to the one electron within the 1 s orbital. Helium has two electrons; therefore, it can completely fill the 1 s orbital with its two electrons.

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     Shells, subshells, and orbitals | Atomic structure and properties | AP Chemistry | Khan Academy

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6. en.wikipedia.org › wiki › Electron_shellElectron shell - Wikipedia

   en.wikipedia.org › wiki › Electron_shell

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   In chemistry and atomic physics, an electron shell may be thought of as an orbit that electrons follow around an atom's nucleus. The closest shell to the nucleus is called the "1 shell" (also called the "K shell"), followed by the "2 shell" (or "L shell"), then the "3 shell" (or "M shell"), and so on farther and farther from the nucleus.

   Z	Element	No. Of Electrons/shell	Group
   1	Hydrogen	1	1
   2	Helium	2	18
   3	Lithium	2, 1	1
   4	Beryllium	2, 2	2

   See full list on en.wikipedia.org

7. chem.libretexts.org › Courses › UWMilwaukee4.7: Arrangements of Electrons - Chemistry LibreTexts

   chem.libretexts.org › Courses › UWMilwaukee

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   The outermost (valence) has 1 electron. The shell diagram of the Na atom is shown here. The shell nearest the nucleus (first shell) has 2 electrons, the second shell has 8 electrons and the last (outermost) shell has 1 electron (2.8.1)

8. chem.libretexts.org › Bookshelves › General_Chemistry3.4: Electronic Structure of Atoms (Electron Configurations)

   chem.libretexts.org › Bookshelves › General_Chemistry

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   Aug 14, 2020 · Note that for three series of elements, scandium (Sc) through copper (Cu), yttrium (Y) through silver (Ag), and lutetium (Lu) through gold (Au), a total of 10 d electrons are successively added to the (n – 1) shell next to the n shell to bring that (n – 1) shell from 8 to 18 electrons.

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10. openstax.org › books › chemistry-2e6.4 Electronic Structure of Atoms (Electron Configurations)

    openstax.org › books › chemistry-2e

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    Note that for three series of elements, scandium (Sc) through copper (Cu), yttrium (Y) through silver (Ag), and lutetium (Lu) through gold (Au), a total of 10 d electrons are successively added to the (n – 1) shell next to the n shell to bring that (n – 1) shell from 8 to 18 electrons.

11. chemistrytalk.org › electron-shellsElectron Shells | ChemTalk

    chemistrytalk.org › electron-shells

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    Each shell has a maximum amount of electrons it can hold. For example, shell 1n can hold 2 electrons, shell 2n can hold 8 electrons, and shell 3n can hold 18 electrons. The rule to calculate the number of electrons that each shell can hold is 2n 2. E.g. the first shell is 2(1) 2 which gives you 2 electrons.