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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 :

GinnyAnsweridn
Sure, let's solve for the number of neutrons in a single [tex]\(Fe^{2+}\)[/tex] atom with a mass number of 56.

The mass number represents the total number of protons and neutrons in the nucleus of an atom. For Iron (Fe), the atomic number, which indicates the number of protons, is 26.

To find the number of neutrons, we need to use the following steps:

1. Identify the number of protons in the Iron atom. The atomic number of Iron (Fe) is 26, so there are 26 protons.
2. Subtract the number of protons from the mass number to find the number of neutrons.

Given:
- Mass number (A) = 56
- Number of protons (atomic number, Z) = 26

Number of neutrons (N) can be calculated as:
[tex]\[ N = A - Z \][/tex]
[tex]\[ N = 56 - 26 \][/tex]
[tex]\[ N = 30 \][/tex]

Therefore, there are 30 neutrons in a single [tex]\(Fe^{2+}\)[/tex] atom.

The correct answer is 30.
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