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The mass number of [tex]Fe^{2+}[/tex] is 56. How many neutrons are there in a single [tex]Fe^{2+}[/tex] atom?

A. 28
B. 30
C. 56
D. 58


Sagot :

To determine the number of neutrons in a single \( \text{Fe}^{2+} \) atom with a mass number of 56, follow these steps:

1. Understand the terms:
- Mass number (A): This is the total number of protons and neutrons in the atomic nucleus. For \( \text{Fe}^{2+} \), the mass number is given as 56.
- Atomic number (Z): This is the number of protons in the nucleus of the atom. For iron (Fe), the atomic number is always 26.

2. Calculate the number of neutrons:
- The number of neutrons is found by subtracting the atomic number from the mass number.
- Formula: Number of neutrons = Mass number - Atomic number

3. Substitute the values:
- Mass number (A) = 56
- Atomic number (Z) = 26

So, the number of neutrons = 56 - 26

4. Perform the subtraction:
- Number of neutrons = 56 - 26 = 30

Therefore, a single \( \text{Fe}^{2+} \) atom has 30 neutrons.

The correct answer is:
30