Multiple Choice
Which term is used to describe particles that carry a negative or positive electric charge?
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2. Atoms & Elements
Ions
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Which ion is formed when an atom of mercury (Hg) loses two electrons?
A
Hg^{2-}
B
Hg_{2}^{2+}
C
Hg^{2+}
D
Hg^{+}
Verified step by step guidance1
Understand that when an atom loses electrons, it forms a positively charged ion called a cation.
Identify the element in question: mercury (Hg). The neutral mercury atom has no net charge.
Since the problem states the atom loses two electrons, the charge on the ion will be +2 because electrons carry a negative charge.
Write the ion symbol by placing the element symbol (Hg) followed by the charge as a superscript: $Hg^{2+}$.
Recognize that $Hg^{2-}$ would indicate a gain of two electrons (an anion), and $Hg^{+}$ indicates loss of one electron, so these are incorrect for losing two electrons.
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