The phrase "are sodium" is not correct and does not make sense in written English.
It could be used in a context where you are trying to describe something that is sodium, but it needs additional context or structure to be meaningful.
Example: "The elements that are sodium include various isotopes and compounds."
Alternatives: "are sodium ions" or "are sodium compounds".
Nearly all processed foods are sodium rich and potassium poor.
These solids can be any substance, but the key elements are sodium, magnesium and calcium.
The feldspathoid group minerals are sodium, potassium, and calcium aluminosilicates, many of which resemble the feldspars in appearance.
The most important are sodium silicate (water glass), sodium carbonate (soda ash), sodium perborate, and various phosphates.
The ingredients used in curing and pickling are sodium nitrate, sodium nitrite, sodium chloride, sugar, and citric acid or vinegar.
The three chemicals used for lethal injections are sodium thiopental, which renders a person unconscious; followed by Pavulon, which paralyzes the muscles, including those that control breathing; followed by potassium chloride, which causes cardiac arrest.
Antimycotics inhibit the growth of molds in such products as fruit juice, cheese, bread, and dried fruit; examples are sodium and calcium propionate and sorbic acid.
The two most common are sodium chloride swept up from the oceans and sulfate-bearing compounds formed through gaseous reactions in the atmosphere.
Among them are sodium chromate, Na2CrO4, and sodium dichromate, Na2Cr2O7, which are used in leather tanning, in metal surface treatment, and as catalysts in various industrial processes.
Examples are sodium chloride (NaCl), calcium carbonate (CaCO3), sulfur dioxide (SO2), ethanol C2H5OH, and hydrocarbons (CnHm, where n and m are integers).
The particles that make up sodium chloride (NaCl), for example, are sodium ions (Na+) and chloride ions (Cl-), and, although equal numbers of these two ions are present in any sample of sodium chloride, no Na+ ion is associated with a particular Cl- ion to form a neutral molecule having the composition implied by the formula.
