the mass number of fe2+ is 56. how many neutrons are there in a single fe2+ atom? 28 30 56 58
the mass number of fe2+ is 56. how many neutrons are there in a single fe2+ atom? 28 30 56 58
Answer
Explanation:
Step1: Recall atomic - number of Fe
The atomic number of iron (Fe) is 26. This is a known constant for the element iron.
Step2: Use the mass - number formula
The mass number (A) is the sum of protons (p) and neutrons (n), i.e., $A=p + n$. We know that the number of protons is equal to the atomic number. Given $A = 56$ and $p=26$. We can find the number of neutrons by rearranging the formula to $n=A - p$.
Step3: Calculate the number of neutrons
Substitute $A = 56$ and $p = 26$ into the formula $n=A - p$. So, $n=56 - 26=30$.
Answer:
30 (corresponds to the second option in the multiple - choice list)