Electrons are particles containing a negative charge and as such repel each other. The chemical bonds themselves contain electrons, and because of the repulsive effect of the particles find themselves to assume the position that distances the electrons from eachother as much as possible. For example an atom with 3 bonding domains and no lone pairs can distribute the bonds at 120 degrees from each other, the greatest distance possible between them.
The electron pairs "repel" one another. These pairs can be bonding pairs or lone pairs. This is the basis of VSEPR theory. To a first appoximation the molecular shapes caused by different numbers of electron pairs pairs are (ignoring the greater strength of lone pair - bonded pair repulsions) :-
2 linear
3 trigonal
4 tetrahedral
5 trigomal bipyramid
6 octahedral
neutrons and protons
Chemical properties of an element determine by the number of electron
they determine the difference between the elements like a hydrogen atom has 1 electron and carbon has 6
There are four pairs of electrons around the central carbon atom of methane. These pairs each consist of one electron originally from the carbon and one from the hydrogen atom bonded to it.Though the question only considers the outer shell of electrons, as that is the only shell used for bonding, it may be useful to remember that in methane the carbon atom has a total of ten electrons around it, due to its two inner electrons.
The electron density is simply deduced from the atomic density as follows : if ne denotes the electron density and na the atomic density then : ne= z na with z being the number of valence electron per atom.
It has 4
Consider: Number of bonding domains on the central atom Number of non-bonding electron pairs (lone pairs) on the central atom
The number of electron pairs around the central atom determines its shape by following the VSEPR theory, which states that electron pairs arrange themselves around the central atom to be as far apart from each other as possible. The arrangement of electron pairs gives rise to specific molecular geometries, which in turn determine the overall shape of the molecule.
It is five because there is a total of five electron pairs around the bromine atom.
The number of protons determine which element an atom is and normally the number of electrons is equal to it. Strip an electron off an iron atom and you have an ionised iron atom.
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4
Consider: Number of bonding domains on the central atom Number of non-bonding electron pairs (lone pairs) on the central atom
neutrons and protons
Chemical properties of an element determine by the number of electron
Chemical properties of an element determine by the number of electron
they determine the difference between the elements like a hydrogen atom has 1 electron and carbon has 6