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They are lost.

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Q: Are valence electrons lost gained or shared during a chemical reaction?
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What is an electron called in the outermost energy level?

They are called valence electrons, and they are responsible for an atom's chemical properties. During a chemical reaction, the valence electrons are the only part of an atom that participates.


During a chemical reaction atoms rearrange their valence electrons in order to become?

broken and recreated or mixed with other chemicals


Are exchanged or shared during the formation of a chemical bond?

They are the electrons in the (outer) valence shell


Which electron on an atom is the most likely one to be removed during a chemical reaction?

Electrons called valence electrons are most likely removed. These are the outermost energy level electrons.


Do non-metals gain electrons in chemical reactions?

during a chemical reaction valence electrons are most always transferred


What role do valence electrons play in formation of bonds?

Valence electrons are electrons on the outermost "level". And depending on its electron configuration, it plays a role in which if the atom requires to gain or lose electrons in order to become "stable", it can accept or give electrons to another atom in a chemical reaction.


What is the number of electrons that are lost or gained or shared by an atom during the course of a chemical reaction?

The number specified is called the "valence" of the atom for the particular reaction occurring. (Some elements have more than one possible valence.)


Is the elecron configuration of an atom related to its tendency to give up or gain electrons during a chemical reaction?

Yes. If there are 1 to 3 valence electrons in an atom, then generally those elements will lose these electrons to attain noble gas configuration. If there are 5 to 7 valence electrons, then generally those elements will gain electrons to attain noble gas configuration.


Do alkali metals give up one valence electron during a chemical reaction?

Yes, it is correct.


What parts of a magnesium atom interact with other atoms during chemical reactions?

Some or all of its valence electrons.


Why did the protons did not participate during chemical bonding?

Chemical bonding only involves the outermost level of electrons, valence electrons. The actual reaction takes place far away from the nucleus of the atom where the protons are. There are reactions that involve the protons, though, but they are nuclear reactions, not chemical reactions. They are usually achieved through high-speed collision in labs.


What does the group number of an element tells us?

Elements on the periodic table in the same group have the same number of valence electrons. Since valence electrons are the only part of an atom that interacts with other atoms during a chemical reaction, you can make generalizations about elements' reactivity based upon what group they're in. Elements in the same group will behave similarly in chemical reactions even if they bear little resemblance to each other physically.