How many neutrons are in the nucleus of an iron atom represented by 57^26Fe?

To find the number of neutrons in an atom, we can use the following formula:

Neutrons = Mass Number – Atomic Number

In the notation 57²⁶Fe, the mass number (the number at the top) is 57, and the atomic number (the number at the bottom) is 26.

Now, we can substitute the values into the formula:

Neutrons = 57 – 26 = 31

Therefore, the nucleus of an iron atom represented by 57²⁶Fe contains 31 neutrons.