A maximum of 110. But for any given element, each energy level is not necessarily filled completely before moving on to the next one, so you have to look up the electron configuration for each one to be sure how many electrons it has in each of its shells.
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The first energy level (n=1) can hold a maximum of 2 electrons, the second energy level (n=2) can hold a maximum of 8 electrons, the third energy level (n=3) can hold a maximum of 18 electrons, the fourth energy level (n=4) can hold a maximum of 32 electrons, and the fifth energy level (n=5) can hold a maximum of 50 electrons.
Phosphorus has five valence electrons.
No, xenon has multiple energy levels due to its electron configuration. Xenon has a total of 54 electrons, which occupy different energy levels within the atom. It is a noble gas with a full outer shell of electrons, leading to a stable configuration.
A neutral atom of xenon has 6 energy levels, with 54 electrons occupying those levels. Xenon has 54 electrons in total, so no electrons would be left over in a neutral xenon atom.
The atom with five electrons in its outer level and ten in its kernel is a neutral sulfur atom. In its ground state, sulfur has 16 electrons distributed with 2 in the first energy level (kernel) and 2, 8, and 6 in the subsequent energy levels.
The atom with five electrons in its outer level and ten electrons in its kernel is boron. Boron has an atomic number of 5, with two electrons in the first energy level and three electrons in the second energy level.