The octet rule does not always hold for which of the following elements _________________?
Correct answer: D. P
- A. C
- B. O
- C. F
- D. P
Explanation
Phosphorus can form compounds such as PCl5 in which it has ten electrons around the central atom, showing an expanded valence shell beyond the octet. Carbon, oxygen and fluorine generally obey the octet rule in their common compounds. Students may choose c because fluorine is highly electronegative, but electronegativity does not make it an expanded-octet element.
Last updated
About VSEPR Theory
Valence shell electron pair repulsion theory predicts molecular shape by arranging bonding pairs and lone pairs around a central atom to minimize repulsion. Questions cover linear, trigonal planar, tetrahedral, trigonal bipyramidal and octahedral electron geometries, bond angles and distortions caused by lone pairs. Electron geometry is not always the same as molecular shape.
Practise Chemical Bonding
964 free Chemical Bonding MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Chemistry questions like this
Chemistry is on 12 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
Related questions
A six-coordinate complex of formula CrCl3.6H2O has green color. A 0.1 M solution of the complex, when treated with an excess of AgNO3, gave 28.7 g of a white precipitate. The formula of the complex would be_.
According to VESPR Model the geometry of molecule having 5 bond pair in outer most shell will be __________________?
According to VSEPR theory, a molecule with four bond pairs and no lone pairs on the central atom is
According to VSEPR theory, the shape of a molecule is decided by
Choose the molecule that could not be represented by single electronic structure formula: