Answer :
The element forms an ion with the same charge as the ammonium ion is:
d. nitrogen.
The ammonium ion is formed by the addition of a proton to the ammonia molecule (NH₃). Ammonia has a lone pair of electrons on the nitrogen atom. When a proton is added to this lone pair, the nitrogen atom becomes positively charged. The ammonium ion is thus NH₄⁺.
Nitrogen can also form an ion with a charge of -3, known as the nitride ion (N₃⁻). This ion is formed by the removal of three electrons from the nitrogen atom.
However, the ammonium ion is the most common ion formed by nitrogen. It is found in many different compounds, such as ammonium chloride (NH₄Cl) and ammonium nitrate (NH₄NO₃).
Potassium, oxygen, chlorine, and calcium do not form ions with the same charge as the ammonium ion. Potassium forms an ion with a charge of +1, but it is not the same ion as the ammonium ion. Oxygen and chlorine form ions with a charge of -2. Calcium forms an ion with a charge of +2.
Therefore, the only element in the list that forms an ion with the same charge as the ammonium ion is nitrogen.
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