how many valence electrons do most atoms need to be stable?
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Most of the elements important in biology need eight electrons in their outermost shell in order to be stable, and this rule of thumb is known as the octet rule. Some atoms can be stable with an octet even though their valence shell is the 3n shell, which can hold up to 18 electrons.
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Most atoms do not have eight electrons in their valence electron shell. Some atoms have only a few electrons in their outer shell, while some atoms lack only one or two electrons to have an octet.
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The Group 1 atoms have 1 valence electron. The Group 2 atoms have 2 valence electrons. The Group 3 atoms have 3 valence electrons. The Group 4 atoms have 4 valence electrons.
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Electronic configuration includes - 2,8,8,1. According to the octet rule, the atom or ion to be stable has to have 8 electons in the outermost shell.
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As you know, an element's valence electrons are simply the electrons located on the outermost energy level, i.e. on the highest occupied energy level. Therefore, you can say that an element located in group 5A has 5 electrons on its highest occupied energy level.
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Octets are particularly stable electron arrangements. Noble gases already have 8 valence electrons (except for helium) and are in very stable states. They have no need to gain or lose electrons, so they are "happy".
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Valence electrons are the electrons in the highest energy level or outer shell and increase in number as you go left to right for the representative elements. However, the transition metals usually have one or two valence electrons.
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Neon therefore has 8 valence electrons. The shells of an atom can only hold so many electrons. Each shell has a certain amount of subshells (s, p, d, etc) that have a certain amount of orbitals.
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The halogen elements have seven valence electrons in their outermost electron shell. Therefore, when these elements can receive an electron from another atom, they form very stable compounds since their outermost shell is full.
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Valence electrons are the number of electrons present in the outermost shell of an atom. Now, the last shell of chlorine atom has 7 electrons in it. Therefore, there are 7 valence electrons present in an chlorine atom. Here, stable means that atom has not formed a ion yet.
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Most of the elements important in biology need eight electrons in their outermost shell in order to be stable, and this rule of thumb is known as the octet rule.
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A: An atom of a group 1 element such as sodium has just one valence electron. It is “eager” to give up this electron in order to have a full outer energy level, because this will give it the most stable arrangement of electrons.
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1 Answer. The most stable electron configuration is that of a noble gas, due to the fact that its valence shell is filled. For helium, that means two valence electrons (a duet) in the 1s sublevel, and for the rest it means eight valence electrons (an octet) in the outermost s and p sublevels.
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The two most reactive groups of elements are the alkali metals and the halogens, because of their valence electrons. Those groups have 1 and 7 valence electrons, respectively, making them desperate to bond to something, to achieve a stable configuration of 8.
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They have a stable number of electrons and do not need to react with other atoms. All other atoms have less stable electron numbers, so they react with each other and share electrons to be more stable. The most reactive elements tend to be short one or two electron or have one or two extra.
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Xenon has eight valence electrons, which are the electrons in its outer shell. This means that the outer shell is full, making xenon a stable element....
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Fluorine has seven valence electron, just one electron is needed to attain an octet or stable configuration.