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