Why are atoms of different elements come into bond formation?

Answer 1

TO complete there octet so that they may stabilize their structures. Elements prefer to have 8 electron in their outer most shells,they are willing to lose, gain or share electron to achieve this. Thats why they bond togather. To attain a formation in which they have 8 electrons in outer most shell.
They strive for this configuration because it is very stable.

Answer 2

Just like water running downhill, all things seek a lower energy level. The same is true of atoms. Those compounds that have a lower energy level tend to form. Those that have a high energy barrier require a lot of energy (often heat) added to force them to get over the energy barrier (sort of like shooting water from a hose over a fence). Once bonds are formed they tend to stay formed because it requires more energy to break up. If little energy is required to break the bonds, the compounds tends to decompose. This is what happens when some explosives explode. Nitrogen Triiodide is an excellent example of a sensitive explosive (that is not very powerful) where the compound decomposes into Nitrogen gas and Iodine vapors, which are more stable.

The octet rules means that elements are attempting to form shells of electrons that have 8 electrons in them when they form compounds. This is visually described by Lewis Structures where dots represent electons. The octet rule is not true for all elements. Boron is an example of an element that usually doesn't require 8 electrons to form a stable compound. It is satisfied with six electrons. But the octet rule is not talking about bonds but rather the entire compound formed by several atoms.

Bonds are between two elements and only require two, four, or six electrons (there are rare examples of other forms that are too complex to go into here). Two electrons form what is called a single bond. You might guess that four electrons form a double bond and six form a triple bond.

There are some unusual exceptions to what I've described but you need to get into graduate chemistry before you would understand what I wrote. And this answer forum doesn't have the visual tools needed to display 3-D things I would need to draw.

Answer 3

They form bond formations to become stable.

Answer 4

to reach a more stable state. the atoms tend to fill their empty orbitals in order to become stable, sharing electrons(or forming bonds) is one of the methods.

Answer 5

Because themselves alone aren't stable(except the inert gases of helium,argon,xenon,krypton...).... They have to bond to achieve the stable configuration of molecules.

Answer 6

easiest way of thinking about it is to say that it completes their octet. the way the orbitals overlap increase or decrease the energy of a reaction and can push it forward.