2 because it has two outer shell electrons out of 8 (relevant rule only for the first 20 elements)
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Beryllium has 4 electrons.
Beryllium-10 has 4 protons and 4 electrons. Since the atomic number of beryllium is 4, this is how many protons and electrons it has. Beryllium-10 is an isotope, which means it has 6 neutrons, as the total mass number of beryllium-10 is 10.
The beryllium atom has 4 electrons and the valence is 2.
A beryllium atom has 4 electrons.
Beryllium has the electronic configuration 2, 2, so it is likely to lose two electrons, giving it the Helium configuration. However, in practice, beryllium compounds have a high degree of covalent character as the beryllium ion is small and very polarising.