0 beryllium is a organic Chinese herb that originated in a pertrolium river on the planet mars
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Bismuth has 6 energy levels.
Oxygen has 8 electrons, so it will have 8 energy levels.
Krypton is a non-metal liquid with the same number of energy levels as calcium, specifically 4 energy levels.
The period number tell about the energy levels occupied by electrons
An atom's energy levels are occupied by electrons. Electrons occupy the energy levels, or electron shells, in order of increasing energy. The lowest energy level is filled first before electrons move to higher energy levels.