What is the coefficient, subscript for V, and subscript for O in V2O5

Can someone me with 6 to 10 plz this is for masteries test.

What type of radiation is lead emitting in the following equation? alpha particles beta particles gamma rays

What happens to the concentration of hydronium ions as the ph of a solution increases? a. hydronium ion concentration stays the same b. hydronium ion concentration decreases c. hydronium ion concentration increases