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I'm guessing this means why only eight electrons. An atoms outermost orbit of electrons is called its valence. An atoms valence determines how reactive an element can be. There can actually be a lot more than 8 electrons in an atoms valence. There are 4 types of orbitals s,p,d,f. They contain 1,3,5, and 7 orbitals respectively. Each orbital can hold 2 electrons. There is specific sequence of electron filling order to know where they are placed in the orbitals. That's another story.
One trend that all noble gases have is that all the orbitals in their valence are filled. They are the most stable formations on the Periodic Table making them very unreactive. This question is unclear
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When an atom or an ion has 8 valence electrons it is more or less stable than when it ha fewer than eight valence electrons?
Valence electrons are the amount of electrons in the outermost electron shell. 8 valence electrons fill the outer shell making it completely stable.
How many electrons do the elements of the most stable group have in their outer layer?
Eight, except for helium which has two.
Why are noble gases insert?
They have completely filled shells, with eight valence electrons (stable) and hence are inert.
Noble gases have a set of eight outermost electrons which forms what?
It forms an octet / stable electronic configuration
Why are noble gases stable and unreactive?
Noble gases are stable because they have a complete outer shell - that is, eight valence electrons. Other elements react in order to gain or lose valence electrons, but noble gases are satisfied.
How many electrons normally does it take to make an atom chemically stable what is the exception to this rule?
The number of electrons must be eight.
When an atom has eight valence electrons it has a stable arrangement called what?
stable electronic configuration
What rules are used to assign oxidation number?
First, determine which family it is in on the periodic table. The group number equals the number of valence electrons that it has. It needs to end up with eight valence electrons to have a full octet. So if it has seven valence electrons, it will gain one electron to be stable. On the other end of the table, it will lose electrons to be stable.
How many electrons to most elements need to become stable?
Most elements need 8 electrons in their valence shells.
Is the most atom more or less stable when they have eight valence electrons true or false?
less stable
What is the oxidation number of N?
The oxidation number of N, or Nitrogen, is N-3. Nitrogen is in group five, meaning it has five valence electrons. It needs to get eight to be stable. So it will gain 3 electrons to be stable. If you gain electrons, that makes it a negative number since electrons are negative in charge.
Is an atom with a complete octec chemmically stable?
Typically an atom with a complete octect on its valence shell is chemically stable. There are exceptions to this rule, as with any other. The nonmetals below the row of Carbon, Nitrogen, Oxygen and Fluorine typically accept more. The rule of thumb is that a stable atom is one that has eight electrons on its valence (or outermost) shell.
How many electrons does an atom need in its outer energy level to be stable?
Most atoms require eight electrons in the outer shell to be stable. The exception is atoms that are only filling the s1 orbital, which becomes stable with only two electrons.
Why is an atom that has eight valence electrons less reactive?
Because it is already stable!
Which noble gases are the most chemically stable?
Gases with eight valence electrons.
How many electrons does each element need to be stable on its outside level?
eight
How many electrons are called are needed in the outer energy level of most atoms for the atom to be stable?
Eight electrons, called an octet, are needed by most atoms in order to be stable.
