Multiple Choice
Which of the following correctly identifies the cation and anion present in the compound CrO2?
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2. Atoms & Elements
Ions
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Which of the following best describes what an ion could be?
A
An atom or molecule that has gained or lost electrons and carries a net charge
B
A neutral atom with an equal number of protons and electrons
C
A substance that cannot be broken down into simpler substances by chemical means
D
A molecule formed by covalent bonding between two nonmetals
Verified step by step guidance1
Understand the definition of an ion: An ion is a species that carries a net electrical charge due to the loss or gain of electrons.
Recall that a neutral atom has an equal number of protons (positive charges) and electrons (negative charges), resulting in no net charge.
Recognize that a substance that cannot be broken down into simpler substances by chemical means is an element, not necessarily an ion.
Know that a molecule formed by covalent bonding between two nonmetals is a neutral molecule, not an ion.
Conclude that the best description of an ion is 'An atom or molecule that has gained or lost electrons and carries a net charge.'
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