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The word "valance" is used to describe electrons in the outer-most energy level of an atom.

Oxygen has six valance electrons.

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How many electrons does a chemically stable atom have in its outer energy level?

8 electrons


How many electrons are in the outer level of atoms of alkaline earth metals?

You mean valence electron? 2 If your talking about Bohr Diagrams then it depends on the metal


How many electrons are found in the outer lever of all the noble gases except helium?

There are 8 electrons in the outer level of all the noble gases except helium. This full outer level gives them stability and makes them less reactive. Helium, as a noble gas, has only 2 electrons in its outer level.


How many electrons are there in potassium's outer energy level after the bond has formed?

Potassium has 1 electron in its outer energy level. When it forms a bond, it typically donates this electron to another element, leaving it with a full outer energy level.


What are the similarities between alkali metals and halogens?

What causes these to be so reactive is the amount of electrons in the outer most level. Each level after the first (which has 2 if full) if filled will have 8 electrons. Halogens have less than that causing it to be reactive to other elements. (i don't know how many electrons it has in the outer level) The reason why it is reactive is (depending on how many electrons it has in the outer leve) because it is either trying to gain or lose those extra electrons. What causes these to be so reactive is the amount of electrons in the outer most level. Each level after the first (which has 2 if full) if filled will have 8 electrons. Halogens have less than that causing it to be reactive to other elements. (i don't know how many electrons it has in the outer level) The reason why it is reactive is (depending on how many electrons it has in the outer leve) because it is either trying to gain or lose those extra electrons.