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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Answer:- 3. and
Explanations:- An empirical formula is the simplest whole number ratio of atoms of each element present in the molecule/compound.
For example, the molecular formula of benzene is . The ratio of C to H in it is 6:6 that could be simplified to 1:1. So, an empirical formula of benzene is CH.
In the first pair, the ratio of C to H in first molecule is 2:4 that could be simplified to 1:2 and the empirical formula is . In second molecule the ratio of C to H is 6:6 and it could be simplified to 1:1. and the empirical formula is CH. Empirical formulas are different for both the molecules of first pair and so it is not the right choice.
In second pair, C to H ratio in first molecule is 1:2, so the empirical formula is . The C to H ratio for second molecule is 1:4, so the empirical formula is
. Here also, the empirical formulas are not same and hence it is also not the right choice.
In third pair, C to H ratio in first molecule is 1:3, so the empirical formula is . In second molecule the C to H ratio is 2:6 and it is simplified to 1:3. So, the empirical formula for this one is also
. Hence. this is the correct choice.
In fourth pair, first molecule empirical formula is CH. Second molecule has 2:4 that is 1:2 mole ratio of C to H and so its empirical formula is . As the empirical formulas are different, it is not the right choice.
So, the only and only correct pair is the third one. 3. and