27. Apply the Pauli exclusion principle, the aufbau princi-
1 answer:
The Pauli exclusion principle and Hund's rule are important principles to follow when writing electron configuration or drawing orbital diagrams.
Hund's rule is applicable when filling degenerate orbitals. Electrons are first filled singly before they are paired in degenerate orbitals.
Pauli exclusion principle states that two electrons can not have the same value for all the four quantum numbers.
As such; the electron configuration of the elements are;
silicon: 1s2 2s2 2p6 3s2 3p2
fluorine: 1s2 2s2 2p5
calcium: 1s2 2s2 2p6 3s2 3p6 4s2
krypton: 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6
The orbital diagrams are shown in the images attached;
Image 1: Fluorine
Image 2: Silicon
Image 3: Calcium
Image 4: Krypton
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A stable arrangement of eight valence electrons : ³⁵Cl⁻¹
<h3>Further explanation</h3>Chlorine is a halogen gas, located in group 17, p block
Chlorine has an atomic number of 17 and an atomic mass of 35
Electron configuration: [Ne] 3s²3p⁵
If we look at the electron configuration, then Cl will bind 1 more electron so that the configuration is stable like Argon (atomic number 18)
So by binding this one electron, chlorine forms negative ions (anions)
³⁵Cl⁻¹
B. Cl⁻² binds 2 electrons, exceeding the octet rule
C. Cl⁺¹, releases 1 electron, remains unstable
D. Cl, the neutral form of Cl, is still unstable with a 7-electron valence configuration
