8 Questions
What is the oxidation number of each atom in a pure element?
Always zero
What is the sum of oxidation states in neutral molecules?
Always zero
What is the oxidation number of an ion of an element?
Varies depending on the element
Which of the following best describes the oxidation state of an atom in a chemical compound?
The degree of oxidation of the atom
What does the oxidation state of an atom in a compound represent?
The degree of ionicity of the compound
Why is the oxidation state of an atom in a compound considered a formalism?
It varies depending on the choice of electronegativity scale
Which of the following is NOT true about the oxidation state of an atom in a compound?
It is always equal to the actual charge on the atom
Why is the oxidation state a useful predictor of charge in many chemical compounds?
Because it accounts for the degree of ionicity in the compound
Study Notes
Oxidation Numbers and States
- In a pure element, the oxidation number of each atom is zero.
- In neutral molecules, the sum of oxidation states is zero.
Oxidation States of Ions and Atoms
- The oxidation number of an ion of an element is equal to its charge.
- The oxidation state of an atom in a chemical compound represents the number of electrons an atom can gain, lose, or share to form a bond.
Characteristics of Oxidation States
- The oxidation state of an atom in a compound is a formalism, meaning it is a hypothetical or theoretical concept rather than a physically measurable quantity.
- The oxidation state is NOT an actual charge on an atom in a molecule.
- The oxidation state is a useful predictor of charge in many chemical compounds because it helps in predicting the reactivity of atoms and molecules.
Test your knowledge of oxidation numbers with this quiz! Learn about the rules for determining oxidation numbers and how they relate to bonding between elements. Challenge yourself to correctly identify the oxidation numbers for various elements and compounds.
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