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sergey [27]
3 years ago
10

A neutral atom of beryllium (Be) has an average mass of 9 amu and 4 electrons. How many neutrons does it have?

Chemistry
1 answer:
MrRa [10]3 years ago
6 0

Answer:

It has 5 neutrons

Explanation:

The fact that it is a neutral atom tells us that the number of electrons and protons is the same:

  • The problem tells us there are 4 electrons, thus there are 4 protons.

The average mass of an atom is the sum of the number of protons and the number of neutrons:

  • Mass = # Protons + # Neutrons

With the above information in mind we can <u>calculate the number of neutrons</u>:

  • 9 amu = 4 Protons + # Neutrons
  • # Neurons = 5 Neutrons
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