Beryllium 9 and Beryllium 10, however, beryllium 10 is not a fully stable element, and will decay in the course of something like 1 billion years, so is often considered stable nonetheless.
Lithium has two stable isotopes, lithium-6 and lithium-7. There are also several radioactive isotopes of lithium, with lithium-8 being the most common radioactive isotope.
Sodium-23 and Sodium-22 are two common isotopes of sodium. Na-23 is the only stable isotope of Sodium. Na-22 is one of the two isomers (the other of which is Na-24). -V
Beryllium has one outer electron shell with two electrons.
Most elements contain a mixture of isotopes, which are atoms of the same element with different numbers of neutrons. Isotopes can have different properties but behave similarly in chemical reactions due to their identical number of protons.
Beryllium tends to lose two electrons to form a 2+ cation.
Lithium has two stable isotopes, lithium-6 and lithium-7. There are also several radioactive isotopes of lithium, with lithium-8 being the most common radioactive isotope.
Sodium-23 and Sodium-22 are two common isotopes of sodium. Na-23 is the only stable isotope of Sodium. Na-22 is one of the two isomers (the other of which is Na-24). -V
The valence of beryllium is two.
The number of protons is the same.
The same numbers of protons and of electrons; the difference between isotopes is in the number of neutrons.
The proton and electron number are equal for all isotopes of the same specific element.
I might be wrong but: I know that beryllium has two electrons total and the first ring can only fit two electrons so the number of valance electrons is most likely two. Please correct me if I'm wrong.
2 electrons. He-4 and He-3 are the two most occuring isotopes.
The number of protons is identical.
Yes, gallium does have naturally occurring isotopes. The most common stable isotopes of gallium are gallium-69 and gallium-71, with gallium-69 being more abundant at about 60% and gallium-71 about 40%.
Different Isotopes of the same element will each exhibit the same Chemical Characteristics.
Beryllium has two electron shells.