A phosphorus atom gains three electrons to form a phosphide anion when forming a chemical bond to a metal I believe
Under acidic conditions, the solution is red, and under alkaline conditions, the solution is blue. Chemical reactions other than acid-base can also cause a color change to litmus paper. For instance, chlorine gas turns blue litmus paper white – the litmus dye is bleached, because of presence of hypochlorite ions.
Answer:
The atomic theory has changed over time as new technologies have become available. Scientific knowledge builds on past research and experimentation. 400 B.C. Democritus, a philosopher in ancient Greece, began the search for a description of matter.
Explanation:
Answer: The chemical formula of this precipitate is 
.
Explanation:
An equation which depicts the chemical reaction of substances in the form of chemical formulas is called a chemical equation.
For example, chemical equation for an aqueous solution of sodium phosphate 
and an aqueous solution of magnesium sulfate 
are mixed, a precipitate forms is as follows.
Here, trimagnesium phosphate is the precipitate. The chemical formula of this precipitate is .
Thus, we can conclude that the chemical formula of this precipitate is .
