I think you mean, "Can they wear out?" And by that, do you mean they just run out of energy like a battery? Remember that energy cannot be made or destroyed. Electrons are constantly being transferred and so even if they leave one area, they are not really gone. and they do not just die out. They just move on to the next thing, forever.
No
the electrons in the outermost shell of an atom are considered to be the valence electrons.
Valence electrons
The electrons farthest away from the nucleus are the valence electrons of an atom.
Chlorine has 17 electrons. 7 of its electrons are valence electrons.
electrons*
Electrons, for chemical reactions
the electrons in the outermost shell of an atom are considered to be the valence electrons.
Electrons in the outermost shell are valence electrons!
Valence electrons
Lone-pair electrons, Bonded pairs of electrons
The electrons (especially the valence electrons)
8 electrons
The electrons farthest away from the nucleus are the valence electrons of an atom.
Chlorine has 17 electrons. 7 of its electrons are valence electrons.
N(nitrogen) = 7 electrons 3O(three oxygen) = 3* 8 electrons = 24 electrons 7 electrons + 24 electrons = 31 electrons in NO3 ( nitrogen trioxide ) ==============================
These electrons are called valence electrons.
electrons*