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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