Atom is a cheical that makes up molecules.
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The arrangement of the electrons in an atom is known as its electron configuration.
valence electrons
Berylium with an electron structure of 1s22s2 has 4 electrons.
== == The valency of an element is the measure of electrons it needs or needs to loose to obtain a stable structure (a noble gas structure, such as helium, neon, argon ...) for example in NaCl, sodium has 11 electrons which means 1 valence electron, chlorine has 17 electrons which means it has -1 valence electrons; so sodium looses 1 electron and chlorine gains that electron so sodium ends up with 10 electrons (Neon's electron structure) and chlorine ends up with 18 electrons (Argon's electron structure) the number of outer electrons. Noble elements are the most stable elements (thats why they don't react well and stay alone, like helium) so all the other elements try to obtain the noble electron structure. Elements usually gain or loose 4 electrons.
well because of the free electrons in the structure of aluminium it is able to allow the passage of electron from electric current due to disassociated electrons in its structure basically because of the metallic bonding and the free electrons present it can conduct electricity and heat.
It represents the number of valence electrons in the atom.
Since hydrogen atoms only have one electron, two hydrogen atoms would share one pair or two electrons with each other.
The electron structure of a chemical element Indicate the location of electrons on shells.
The arrangement of the electrons in an atom is known as its electron configuration.
the dots are the number of electrons in an elements valance shell (last shell). if it has no dots, it means it has lended its electrons to another element to become stable like its nearest noble gas.
valence electrons
mg
Berylium with an electron structure of 1s22s2 has 4 electrons.
== == The valency of an element is the measure of electrons it needs or needs to loose to obtain a stable structure (a noble gas structure, such as helium, neon, argon ...) for example in NaCl, sodium has 11 electrons which means 1 valence electron, chlorine has 17 electrons which means it has -1 valence electrons; so sodium looses 1 electron and chlorine gains that electron so sodium ends up with 10 electrons (Neon's electron structure) and chlorine ends up with 18 electrons (Argon's electron structure) the number of outer electrons. Noble elements are the most stable elements (thats why they don't react well and stay alone, like helium) so all the other elements try to obtain the noble electron structure. Elements usually gain or loose 4 electrons.
18
The electrons in the outermost shell of an atom is known as the valence electrons. These valence electrons determine the reactivity of the atom.
Electron Dot Structure