Okay Hi I am A Freshman and this question was really hard but i have the answer... they combine because they both want to have 8 electrons... so they share electrons and that bonds keep them together love,jade
They share electrons when they try and corm covalent or ionic bonds. This is because the atoms want to gain a full outer shell. So when they share electrons they can have full shells.
Elements want to gain or lose electrons in order to achieve a stable electron configuration, usually by attaining a full valence shell of electrons. This helps them achieve a more stable, lower energy state, similar to the configuration of noble gases.
because they have outer electrons than can merge with other elements. all elements want to have full outer electron shells, and they only have a few outer electrons.
all elements want to have a full valence shell and when an atom loses electrons it is said to become a cation.
They all have 7 outermost electrons and want to get to a stable octet. The easiest way to do this is to pair up and share an electron so they both have 8 and hence they are diatomic.
the element with seven valence electrons will be more reactive. The reason for this is that elements want to always want to have a full valence shell (they always want 8, like a noble gas). The element with eight valence electron is happy with its full shell and will not want to get rid of any electrons.
Nonmetallic elements take electrons from metals because unstable elements want to have a full valence (outer) electron shell. The metallic elements usually have a less then half full valence shell, it would be easy for them just to get rid of the electrons opposed to having to find more. Nonmetals usually only need one to four electrons so taking them from a metal would be easier then losing all of their electrons.
This is more Chemistry than Physics. But I'll put it quite simply: If you look at a Periodic Table from left to right, you see that there are 18 columns of elements (called groups). The farthest group on the right, made up of the elements Helium, Neon, Argon, Krypton, Xenon, and Radon. These elements are known as "noble gases" and they are extremely stable (meaning they are the least likely elements to react with other elements in the entire table). What the noble gases all have in common is that they all have a total of 8 valence electrons (they are the electrons on the outside of the atom's last orbital). Now, look at all the other elements on the periodic table. They don't have 8 electrons (more or less, they possess 1-7 electrons in their last orbital). These elements WANT 8 electrons so they can be stable like a noble gas too. This is why they will sometimes form bonds (these bonds are called covalent bonds [equal sharing of electrons] or polar covalent bonds [unequal sharing]) where they will share electrons between each other so each atom can have 8 electrons and be "happy".
Elements combine to form compounds in order to become more stable by filling their outer electron shells. By sharing or transferring electrons, elements can achieve a full outer shell, which lowers their energy state and increases their overall stability. This process allows elements to form a wide variety of compounds with different properties and functions.
They have 4. They "want" to share 8, but they don't always get to do so. Carbon monoxide is the best example of incomplete combustion.
No - it would want to lose these two electrons