what is the outer energy level for beryllium?
To determine the outer energy level for beryllium, we need to look at its electron configuration. Beryllium has an atomic number of 4, meaning it has 4 electrons.
The electron configuration of beryllium is 1s² 2s². This means that the first energy level (n=1) contains 2 electrons, and the second energy level (n=2) also contains 2 electrons.
The outermost energy level is the highest occupied energy level, which in this case is the second energy level. Therefore, the outer energy level for beryllium is the second energy level.