Multiple Choice
Which process leads to the formation of ions?
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2. Atoms & Elements
Ions
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Which of the following is an ion?
A
Na^+
B
CH_4
C
H_2O
D
O_2
Verified step by step guidance1
Understand what an ion is: an ion is an atom or molecule that has gained or lost one or more electrons, resulting in a net electrical charge.
Examine each species given: CH_4 (methane), H_2O (water), O_2 (oxygen molecule), and Na^+ (sodium ion).
Recognize that CH_4, H_2O, and O_2 are all neutral molecules with no net charge because they have equal numbers of protons and electrons.
Identify that Na^+ has a positive charge, indicated by the superscript plus sign, meaning it has lost one electron and is therefore an ion.
Conclude that among the options, Na^+ is the ion because it carries a net positive charge, while the others are neutral molecules.
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