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Answer:

Beryllium's atomic number is 4

Explanation:

Reason

  1. Beryllium has 4 protons, 4 neutrons, and 4 electrons.
  2. This makes it a nuetral atom meaning that it contains an equal amount of protons and electrons
  3. This means that beryllium has a atomic number of 4

Answer:

the atomic number 4

Explanation:

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