17P 15
Every sodium atom has 11 protons, the atomic number of sodium. The isotope with mass number 23 has (23 - 11) or 12 neutrons, because the mass number of an isotope is defined as the sum of the numbers of protons and neutrons in the isotope.
There are 15 protons in 31P. All isotopes and ions of the same elements will have the same number of protons regardless of the difference in the number of neutrons or electrons. So the information about which isotope is (by saying P-31) is unneeded.
There are several isotopes of Phosphorus (P), all of which have 15 protons. Only one stable isotope exists in nature, having 16 neutrons. 31P has 16 neutrons 32P has 17 neutrons (synthesized radioisotope) 33P has 18 neutrons (synthesized radioisotope)
C15
The atomic number of phosphorus is 15. Thus, neutral phosphorus will have 15 protons and 15 electrons. The only stable isotope of phosphorus is 31P, meaning it has 31 - 15 = 16 neutrons.
Sulfur-31 is the isotope with 16 protons and 15 neutrons.
There are a variety of isotopes that have 30 neutrons. It isn't the number of neutrons that determines an element, but the number of protons. Electrons generally balance the number of protons.
A nitrogen atom has 7 protons, 7 electrons and 7 neutrons for the most common isotope
oxygen has 8 protons as its atomic number is 8. The number of neutrons depends on the isotope. O-15 isotope will have 7 neutrons, O-16 isotope will have 8 neutrons. (Note: Mass number = Number of protons + number of neutrons)
An atom with 15 protons, 15 neutrons, and 15 electrons.
15 protons, 15 electrons and 16 neutrons (for its most stable isotope)
The element is phosphorus and the isotope is 15P35
The element is sulfur and the isotope is 16S31
Oxygen has 8 protons . The number of neutrons depends on the isotope. Oxygen-15 isotope has 7 neutrons and oxygen-16 isotope has 8 neutrons. (Note: Mass number = Number of protons + number of neutrons)
The isotope 7N15
13 protons means it must be aluminum (Al). 15 neutrons means its atomic mass will be 28. This is not aluminum's most abundant isotope, but it is still aluminum.
Every sodium atom has 11 protons, the atomic number of sodium. The isotope with mass number 23 has (23 - 11) or 12 neutrons, because the mass number of an isotope is defined as the sum of the numbers of protons and neutrons in the isotope.