The symbol "31P3-" suggests that you are referring to a specific isotope of phosphorus, denoted as phosphorus-31 (31P). Here's the breakdown of the information you requested:
Atomic number: The atomic number represents the number of protons in an atom. For phosphorus, the atomic number is 15.
Mass number: The mass number is the sum of protons and neutrons in the nucleus of an atom. Since the isotope is phosphorus-31 (31P), the mass number is 31.
Number of protons: The number of protons in an atom is equal to its atomic number. In this case, phosphorus has 15 protons.
Number of neutrons: To determine the number of neutrons, subtract the atomic number from the mass number. For phosphorus-31, subtracting 15 from 31 gives us 16 neutrons.
Charge: The symbol "3-" indicates that the atom has a charge of -3. This means the atom has gained three extra electrons, resulting in a negative charge.
To summarize:
Atomic number: 15 Mass number: 31 Number of protons: 15 Number of neutrons: 16 Charge: -3