Phosphorus has an atomic atomic number of 15 and an atomic number mass of 31. How many neutrons does it have?
a. 5
b. 16
c. 30
d. 31
e. 47
Answer: b. 16
Phosphorus has an atomic atomic number of 15 and an atomic number mass of 31. How many neutrons does it have?
a. 5
b. 16
c. 30
d. 31
e. 47
Answer: b. 16