Multiple Choice
What must happen to an atom of magnesium in order to become a magnesium ion, Mg^{2+}?
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2. Atoms & Elements
Ions
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Why do atoms form ions?
A
To become radioactive
B
To change their number of protons
C
To achieve a more stable electron configuration, often resembling that of noble gases
D
To increase their atomic mass
Verified step by step guidance1
Understand that atoms form ions primarily to achieve a more stable electron configuration, which usually means having a full outer electron shell similar to that of noble gases.
Recall that atoms do not change their number of protons when forming ions; changing protons would change the element itself, which does not happen in ion formation.
Recognize that atoms do not become radioactive simply by forming ions; radioactivity involves changes in the nucleus, not electron arrangement.
Note that increasing atomic mass is not a reason for ion formation; atomic mass changes involve nuclear reactions, not electron gain or loss.
Conclude that the driving force behind ion formation is the atom's tendency to reach a lower energy, more stable state by gaining or losing electrons to complete its valence shell.
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