its because some are naturally stable like helium, when some like hydrogen have an extra electron in their electron clouds. That's why they are unstable. When they meet with an element with one extra electron they can be stable because the first electron cloud holds 2 electrons. ex. :
hydrogen - 1 electron
hydrogen - 1 electron
adding both together will give you a full eletron cloud.
Hope this helps!
Most elements are not stable in there natural state, so they combine with other elements to form a compound. The elements found in nature by themselves are stable enough that they do not need to react with another element.
because they are not stable in pure form. because they are not stable in pure form.
All the metals specially alkali and alkaline earth metals.
Their electron configurations are different.
because some elements need to share and receive electrons in order to become stable.
because of the valence toms
Stable elements do not react because they don't need to. Elements react so that they can gain stability( as stability is gained by filling the outer most shell of the atom). As stable elements already have full outer shells and are stable , they do not react.
When an element enters into a compound, a chemical reaction occurs. This means that the elements chemically combine and sub-atomic particles transfer between the elements involved. An Example of a Compound: Sodium Chloride (Table Salt): Sodium + Chlorine --> Sodium Chloride
Every element that isn't a noble gas, wants to become isoelectronic or have the same number of electrons as its nearest noble gas. This is because noble gases are very stable, while other elements aren't. Forming compounds allows elements to gain or lose electrons, which allows them to become like their nearest noble gas.
They are called ions
It is the unstable isotopes of elements that decay over time. All elements have an isotope or isotopes that are unstable and will decay over time. (These isotopes will be either naturally occurring or will be synthetic.) Some isotopes of some elements, however, are stable, and they will not undergo radioactive decay.To discover what's what, we have to do some homework, and what better place to start than the table of nuclides? It lists all the elemets, and all the isotopes of each element. Further, it tells us which ones are stable, which are unstable, and will also help us determine the decay mode of the unstable nuclides.
because of the valence toms
because of the valence toms
because of the valence toms
because of the valence toms
Elements combine to form compounds to become more stable
For example, xenon, a noble gas can form stable compounds.
compounds
because of the valence toms
Each element can form stable, less stable or unstable compounds.
it tells how many atoms are in the unit to be stable
The difference in stability is as a result of the covalent bonds in organic compounds and ionic bonds in the inorganic compounds.
This because it has the valency 4 (called tetra valency) by which it can combine with lots of elements and also it has a property of forming stable compounds