An ion is an element or compound with an overall charge on it. This means that it has extra electrons or are lacking in the amount of electrons it needs in order to achieve the perfect octet (or full valence shell).
For example: Cl- is chlorine but with one extra electron.
A physical description of lead is that it's dense (heavy). A chemical description of lead is that it's insoluble as an ion with few exceptions.
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Bromine is the only element that matches this description.
The element that fits this description is sulfur. Its most stable ion is the sulfide ion (S2-), which contains 18 electrons. Sulfur belongs to the same group as oxygen on the periodic table (Group 16 or 6A), known as the chalcogens.
A solution with a hydroxide ion concentration of 1x10^-4 M would be considered basic. This concentration indicates a low concentration of hydroxide ions, suggesting a slightly basic pH.
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The ion charge of an NH4 ion is 1.
Some foods contain sodium citrate. sodium nitrite, and/or sodium benzoate, all of which fit this description.
Nitride Ion.
A cation is a positively charged ion. Barium ion is Ba^2+, chloride ion is Cl^-, nitrate ion is NO3^-, and chromate ion is CrO4^2-.
The correct name for the cesium ion is "cesium ion" or "Cs+ ion".