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In counting the electron pairs around the central atom in VSEPR theory, __________ are not included.

Sagot :

drpelezo

Answer:

See Explanation

Explanation:

Electron pairs about the central element in simple binary compounds can be determined as follows:

Total e⁻ pairs = Bonded e⁻ pairs + Non-bonded e⁻ pairs

Example:

Given XeF₄ determine the total e⁻ pairs about the central element Xe.

Bonded e⁻ pairs = #substrates bonded to central element

                           = 4 Fluoride atoms

                           => 4 Bonded e⁻ pairs

Non-bonded e⁻ pairs = [Valence# - Substrate#] / 2

Valence# = Xe + 4F = 1(8) + 4(7) = 36 valence e⁻s

Substrate# = 4F = 4(8) = 32 bonded e⁻s (about central element)

Non-bonded e⁻ pairs = V# - S# / 2 = 36 - 32 / 2 = 4/2 = 2 non-bonded pr.

Total e⁻ prs around central element = Bonded Pr e⁻ + Non-bonded e⁻

                                                           = 4 + 2 = 6 e⁻ pairs

This implies a Trigonal Bipyramidal parent geometry with a Square Planer molecular geometry.

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