Question

questions 28 - 31 prompt: complete the tables by filling in the correct number of protons, neutrons and electrons. fill in the blank 1 point isotope phosphorus - 31 charge 3 - # protons type your answer... # neutrons type your answer... # electrons type your answer...

Explanation:

Step1: Recall atomic number of phosphorus

The atomic number of phosphorus (P) is 15. The number of protons is equal to the atomic number. So, the number of protons = 15.

Step2: Calculate number of neutrons

The mass - number of phosphorus - 31 is 31. The formula to calculate the number of neutrons is $n = A - Z$, where $A$ is the mass - number and $Z$ is the atomic number. So, $n=31 - 15=16$.

Step3: Determine number of electrons

The ion has a charge of 3-. A neutral phosphorus atom has 15 electrons. When it has a 3 - negative charge, the number of electrons is $15+3 = 18$.

Answer:

protons: 15

neutrons: 16

electrons: 18