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A neutral xenon atom would have 54 electrons filled in its electron shells.
In a cadmium atom, all 27 s orbitals are filled with electrons. Cadmium has 48 electrons, and the s sublevel can hold a total of 2 electrons per orbital, so 27 orbitals are needed to accommodate all the electrons.
There are two completely filled orbitals in this atom: the 1s orbital with 2 electrons and the 2p orbitals with 6 electrons. The 2s orbital and 3s orbital are not completely filled.
In an arsenic atom, there are three half-filled orbitals. These are the 4s, 4p, and 4d orbitals. Each of these orbitals can hold a maximum of 2 electrons, so there are a total of 6 electrons in the half-filled orbitals of arsenic.
There are two orbitals that are completely filled in this atom: the 1s orbital with 2 electrons (1s2) and the 2s orbital with 2 electrons (2s2). The 2p orbital is not completely filled, as it should have a total of 6 electrons (2p6).