The electronic configuration of xenon is 2, 8, 18, 18, 8. So there are FIVE electrons shells that are filled.
Alternatively, xenon belongs to 5th group, so the fifth shell is the valence shell.
Three electron shells would be completely filled by a neutral xenon atom.
5 shells filled, no electrons left over.
Five shells and none left over.
Xenon's atomic number is 54. Therefore, neutral xenon has 54 protons and 54 electrons. Its configuration is 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6. Thus, xenon has 5 electron shells.
Xenon's atomic number is 54. Therefore, neutral xenon has 54 protons and 54 electrons. Its configuration is 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6. Thus, xenon has 5 electron shells.
Three electron shells would be completely filled by a neutral xenon atom.
Xenon has five electron shells.
5 shells filled, no electrons left over.
Five shells and none left over.
Xenon's atomic number is 54. Therefore, neutral xenon has 54 protons and 54 electrons. Its configuration is 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6. Thus, xenon has 5 electron shells.
5 shells and no electrons would be left over.
Xenon's atomic number is 54. Therefore, neutral xenon has 54 protons and 54 electrons. Its configuration is 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6. Thus, xenon has 5 electron shells.
Helium has only 1 shell with two electrons.
The first 3 energy levels are filled, the 4s and 4p and 4d sublevels are filled, and the 5s and 5p sublevels are also filled. So only the first three energy levels are completely filled. The fourth and fifth energy levels are partly filled. The electron configuration is 1s22s22p63s23p63d104s24p64d105s25p6 or [Kr]4d105s25p6.
Your question reveals a common confusion between orbitals and shells. Chlorine has three electron shells: the first, second and third. The first shell has just the one orbital, the 1s The second shell has two sub-shells, the 2s and the 2p. There are three p orbitals in the 2p sub-shell. Each orbital can hold two electrons, so there are eight electrons maximum in the second shell. The third shell likewise has two sub-shells, the 3s and the 3p, but the 3p is not completely filled, leaving room for one more electron. When chlorine gains this electron it will become a Cl- ion. This is summed up in the electron configuration 1s22s22p63s23p5.
Plutonium has seven electron shells.
3 would be totally filled there would be two left in the fourth ring