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An atom of beryllium has 4 protons and a mass number of 9. How many neutrons does it contain?

A. 3
B. 4
C. 5
D. 9

Sagot :

GinnyAnsweridn
To determine the number of neutrons in an atom, you use the relationship between the mass number, the number of protons, and the number of neutrons.

1. Understand the given information:
- The atom of beryllium has 4 protons.
- The mass number of the atom is 9.

2. Recall the formula:
- The mass number is the sum of the protons and neutrons in the nucleus of an atom. This can be expressed as:
[tex]\[ \text{Mass Number} = \text{Number of Protons} + \text{Number of Neutrons} \][/tex]

3. Set up the equation:
[tex]\[ 9 = 4 + \text{Number of Neutrons} \][/tex]

4. Solve for the number of neutrons:
- Subtract the number of protons from the mass number to find the number of neutrons:
[tex]\[ \text{Number of Neutrons} = 9 - 4 \][/tex]
[tex]\[ \text{Number of Neutrons} = 5 \][/tex]

5. Thus, the atom of beryllium contains:
- 5 neutrons.

The correct answer is:
05
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