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Beryllium has 4 electrons. You can figure this out by referring to a periodic table. You simply locate beryllium on the chart and look at its atomic number. The atomic number is the number located above the element symbol. The atomic number tells the number of protons and since this is a neutral atom, the number of protons is equivalent to the number of electrons.
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Beryllium (Be) has an atomic number of 4 and an atomic mass of 9. Beryllium has 4 electrons therefore the correct option is A.

What is the atomic number?

The total number of protons present in an atom is known as the atomic number of that atom . The atomic number has no correlation either with the number of neutrons or the number of electrons present inside an atom.

While the atomic mass of an atom is the sum of the total number of protons and the number of neutrons present inside of any atom.

For any neutral atom, the total number of protons is equal to the total number of electrons, which is the same as the atomic number of the atom.

In the case of Beryllium (Be) which has an atomic number of 4 and an atomic mass of 9, it is a neutral atom this means that the number of the protons is the same as the number of the electrons.

Therefore, we got to know that  Beryllium has 4 electrons.

Learn more about the atomic number from here

https://brainly.com/question/14190064

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