The element phosphorous (P) has an atomic number of 15 and an atomic mass of 31. How many neutrons are in an atom of phosphorous (P)?

3 answers

To find the number of neutrons in an atom, subtract the atomic number from the atomic mass.

Number of neutrons = Atomic mass - Atomic number
Number of neutrons = 31 - 15
Number of neutrons = 16

Therefore, there are 16 neutrons in an atom of phosphorous (P).
Fluorine has an atomic number of 9 and an atomic mass of 19. How many protons, neutrons, and
The atomic number of an element corresponds to the number of protons in its nucleus. Therefore, fluorine (F) has 9 protons.

To find the number of neutrons, subtract the atomic number from the atomic mass.

Number of neutrons = Atomic mass - Atomic number
Number of neutrons = 19 - 9
Number of neutrons = 10

Therefore, fluorine has 9 protons, 10 neutrons, and 9 electrons (since atoms are neutral and have an equal number of protons and electrons).