Answer:

Explanation:
The atomic number refers to the total count of electrons or protons found in a neutral atom.
Nonetheless, when discussing the atomic number of an ion, it does not correspond to the electron count since electrons can be added or removed.
Therefore, it is more accurate to refer to the number of protons located in the atom's nucleus as the atomic number.
Consequently, the atomic number of phosphorus is 15
The mass number reflects the total count of particles in the nucleus, equating to the addition of protons and neutrons.
Given that the mass number is 32
Thus, the symbol for the isotope is:-

What is being removed during the wash is the solvent.
The ozonolysis of 2,4,4-trimethyl-2-pentene produces a combination of

and

Explanation: In ozonolysis (where a reducing agent like Zn is involved during hydrolysis), a pi bond cleaves to generate ketones or aldehydes.
Ketones arise from the double bond's disubstituted side, whereas aldehydes come from the monosubstituted side of the same bond.
Notably, ozonolysis comprises two steps: (1) the formation of an ozonide, followed by (2) the hydrolysis of the ozonide.
Hydrolysis can transpire with or without a reducing agent. When it occurs without a reducing agent, carboxylic acid, carbon dioxide, or ketones can be produced.
In this case, 2,4,4-trimethyl-2-pentene yields a mixture of
and 
The reaction process is illustrated below.