⚠️LINKS WILL BE REPORTED⚠️ // Need answers as fast as possible! – Electrons always fill orbitals in the same order. Each s orbit

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⚠️LINKS WILL BE REPORTED⚠️ // Need answers as fast as possible!

– Electrons always fill orbitals in the same order. Each s orbital holds 2 electrons, each set of p orbitals holds 6 electrons, each set of d orbitals holds 10 electrons, and each set of f orbitals holds 14 electrons. The order in which orbitals are filled, from first to last, is:

1s 2s 2p 3s 3p 4s 3d 4p 5s 4d 5p 6s 4f 5d 6p 7s 5f 6d 7p

Beryllium has 4 electrons. What is the electron configuration of beryllium?

A.
2s^22p^2
B.
1s^22s^2
C.
2s^4
D.
4p^1

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Linh Đan 5 years 2021-09-01T00:13:17+00:00 1 Answers 9 views 0

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  1. kimchi2
    0
    2021-09-01T00:14:32+00:00
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    Answer:

    1s^2\, 2s^2.

    Explanation:

    Electron orbitals in an atom (e.g., 1s) are denoted with:

    • A number, denoting the shell (principal energy level) of this orbital, and
    • A letter, denoting the shape of this orbital (s, p, d, etc.)

    There are two aspects to consider when finding the electron configuration of an atom:

    • The number of electrons that each type of orbitals could hold, and
    • The order in which the orbitals are filled.

    The s orbital in each shell could hold up to 2 \times 1 = 2 electrons (one s\! orbital per shell, with up to two electrons.)

    The p orbitals in each shell could hold up to 2 \times 3 = 6 electrons (three p\! orbitals per shell, with up to two electrons in each orbital.)

    The d orbitals in each main shell could hold up to 2 \times 5 = 10 electrons (five d\! orbitals per shell, with up to two electrons in each orbital.)

    Refer to the order in which the orbitals are filled (Aufbau principle.)

    • The first orbital to be filled would be 1s (the s orbital of the first shell,) accommodating up to 2 electrons.
    • The second orbital to be filled would be 2s (the s orbital of the second shell,) accommodating up to 2 electrons.

    All four electrons of Beryllium are thus assigned to the 1s and 2s orbitals. In a ground-state Beryllium atom, orbitals 2p and beyond would contain no electrons.

    Notation:

    • Two electrons in the 1s orbital: 1s^{2} (the superscript denotes the number of electrons in this orbital (or group of orbitals).)
    • Two electrons in the 2s orbital: 2s^2.

    Write the non-empty orbitals in the order by which they are filled:

    1s^2\, 2s^2.

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