To determine the name of the ion from the given multiple-choice options, let's carefully analyze each option.
The given options are:
1. Nitride
2. Nitrite
3. Hydronium
4. Nitrate
We recognize that these are four different ions, each with a distinct chemical composition and structure.
1. Nitride (N³⁻): This is an ion of nitrogen with a charge of -3. It is typically found in compounds where nitrogen has a -3 oxidation state.
2. Nitrite (NO₂⁻): This is a polyatomic ion consisting of one nitrogen atom and two oxygen atoms, and it carries a -1 charge. It is often found in salts of nitrous acid.
3. Hydronium (H₃O⁺): This ion is formed by the protonation of water and carries a +1 charge. It is commonly referred to in the context of acids and pH.
4. Nitrate (NO₃⁻): This is a polyatomic ion composed of one nitrogen atom and three oxygen atoms, with a -1 charge. It is commonly found in many fertilizers and is an important nitrogen source for plants.
Based on the provided correct numerical answer, the name of this ion corresponding to option 4 is:
Nitrate (NO₃⁻)
So, the name of the ion is nitrate.
