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wiki.kidzsearch.com/wiki/Valence_electron

In chemistry, valence electrons are the electrons in the outside or valence electron shell of an atom. Valence electrons are important in how a chemical element reacts with other elements. Elements which have eight valence electrons (noble gases) are inert and they do not tend to create chemical reactions with other elements in the Periodic ...

en.wikipedia.org/wiki/Valence_electron

In chemistry, a valence electron is an outer shell electron that is associated with an atom, and that can participate in the formation of a chemical bond if the outer shell is not closed; in a single covalent bond, both atoms in the bond contribute one valence electron in order to form a shared pair.

study.com/academy/lesson/valence-electron-definition...

This method of writing electron configuration helps narrow down valence electrons. Let's take chlorine, which has 17 electrons. The noble gas just before chlorine is neon.

www.britannica.com/science/valence-electron

Valence electron, any of the fundamental negatively charged particles in the outermost region of atoms that enters into the formation of chemical bonds. Whatever the type of chemical bond (ionic, covalent, metallic) between atoms, changes in the atomic structure are restricted to the outermost, or valence, electrons.

www.brighthubeducation.com/science-homework-help/106549...

The function of valence electrons is to transfer between the atom, gaining or losing electrons in the process, in an effort to bring about stability to the atom. Valence electrons are such an essential part of the atom’s stability that an atom will be reactive or inert depending solely on how many valence electrons it has.

www.scienceabc.com/pure-sciences/how-to-find-the-number-of...

Filling the electrons according to our rule, we observe that the 21 st electron occupies the 3d sub-shell. However, as the previously filled 4 th shell (4s) has 2 electrons and is apparently the outermost shell, the number of valence electrons is 2. Similarly, every transition element in the 4 th period must have 2

www.dummies.com/.../why-are-valence-electrons-important

In the electron configuration for oxygen (shown below), energy level 1 is filled, and there are 2 electrons in the 2s orbital and 4 electrons in the 2p orbital for a total of 6 valence electrons. Those valence electrons are the ones lost, gained, or shared.

www.encyclopedia.com/.../chemistry/chemistry-general/valence

A valence number of 1 means that an element will generally react to lose one electron to obtain a full outer shell. Group two elements are assigned a valence number of 2. A valence number of 2 means that a group two element will generally react to lose two electrons to obtain a full outer shell.

chemed.chem.purdue.edu/genchem/topicreview/bp/ch8

Valence Electrons. The electrons in the outermost shell are the valence electrons the electrons on an atom that can be gained or lost in a chemical reaction. Since filled d or f subshells are seldom disturbed in a chemical reaction, we can define valence electrons as follows: The electrons on an atom that are not present in the previous rare gas, ignoring filled d or f subshells.

www.reference.com/science/many-valence-electrons-mercury...

A valence electron is an electron in the outermost shell of an atom. Valence electrons are capable of bonding with the valence electrons of other atoms to form a compound. The electron configuration of mercury can be used to determine the number of valence electrons. The electron configuration is written as 1s2 2s2p6 3s2p6d10 4s2p6d10f14 ...