Bio1332 Biochemistry - Lecture Three - Chemical Bonding
How and why atoms combine.
Questions and Answers
- 1.
Complete the following sentence:There are two types of electron: core electrons and ______ (outside) electrons.
Explanation
Valence electrons are the electrons located in the outermost energy level of an atom. These electrons are involved in chemical bonding and determine the reactivity and chemical properties of an element. Core electrons, on the other hand, are the electrons located in the inner energy levels of an atom and are not involved in bonding. Therefore, the correct answer to complete the sentence is "valence," as it accurately describes the type of electrons found outside the core.Rate this question:
- 2.
Why don't nobel gases bond?
- A.
Filled s and p orbitals in outer shell
- B.
All orbitals in outer shell filled
- C.
Filled d and f orbitals in outer shell
Correct Answer
A. Filled s and p orbitals in outer shellExplanation
Noble gases do not bond because their outermost energy level, or shell, is completely filled with electrons. Specifically, the s and p orbitals in the outer shell are filled with electrons. This complete electron configuration provides noble gases with a stable and low-energy state, making them highly unreactive and unlikely to form chemical bonds with other elements.Rate this question:
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- 3.
Complete the following sentence:Ionic bonding involves the formation of ions through the loss or gain of #_________#.The two ions are held together by #__________# forces.
Correct Answer
Electrons
ElectrostaticExplanation
Ionic bonding involves the formation of ions through the loss or gain of electrons. The two ions are held together by electrostatic forces.Rate this question:
- 4.
Complete the following sentence:Covalent bonding occurs through the _______ of electrons.
Correct Answer
SharingExplanation
Covalent bonding occurs through the sharing of electrons between two atoms. In this type of bonding, the atoms involved share one or more pairs of electrons in order to achieve a stable electron configuration. This sharing of electrons allows both atoms to fill their outermost energy levels and attain a more stable state.Rate this question:
- 5.
Which of the following is true for the values of electronegativity?
- A.
If the difference in values is greater than 1.7, the bond is more likely to be ionic
- B.
If the difference in values is greater than 1.7, the bond is more likely to be covalent
- C.
If the difference in values is less than 1.7, the bond is more likely to be ionic
Correct Answer
A. If the difference in values is greater than 1.7, the bond is more likely to be ionicExplanation
If the difference in electronegativity values between two atoms is greater than 1.7, it indicates a large difference in their ability to attract electrons. This suggests that one atom will have a much stronger pull on the shared electrons, resulting in an unequal sharing of electrons and the formation of an ionic bond. Ionic bonds occur between atoms with significantly different electronegativity values, leading to the transfer of electrons from one atom to another to achieve a stable electron configuration.Rate this question:
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