Multiple Choice
When an atom of magnesium (Mg) loses two electrons, which ion is formed?
1
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2. Atoms & Elements
Ions
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Which formula represents a hydronium ion?
A
H3O^+
B
OH^-
C
NH4^+
D
HCO3^-
Verified step by step guidance1
Understand that a hydronium ion is formed when a water molecule (H2O) gains an extra proton (H+).
Recognize that adding a proton (H+) to H2O results in H3O+, which carries a positive charge.
Identify the chemical formula for hydronium ion as $\mathrm{H_3O^+}$, where the superscript plus indicates the positive charge.
Compare the given options: $\mathrm{OH^-}$ is hydroxide ion, $\mathrm{NH_4^+}$ is ammonium ion, and $\mathrm{HCO_3^-}$ is bicarbonate ion, none of which represent hydronium.
Conclude that the correct formula for the hydronium ion is $\mathrm{H_3O^+}$.
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