Question

25
Mn
Manganese
54.938

Atomic number
atomic mass
# of protons
# of neutrons
# of electrons

Answer 1

Here’s the information for manganese (Mn):

- **Atomic number**: 25
- **Atomic mass**: 54.938
- **# of protons**: 25 (equal to the atomic number)
- **# of neutrons**: To find the number of neutrons, subtract the atomic number from the atomic mass (rounded to the nearest whole number):

\[
\text{Number of neutrons} = \text{Atomic mass} - \text{Atomic number} = 55 (rounded) - 25 = 30 \text{ (approximately, since atomic mass is not a whole number)}
\]

- **# of electrons**: 25 (in a neutral atom, the number of electrons is equal to the number of protons)

So in summary:

- **Atomic number**: 25
- **Atomic mass**: 54.938
- **# of protons**: 25
- **# of neutrons**: 30 (approx.)
- **# of electrons**: 25