You are watching: What element gains three electrons to fill its valence energy level?
The framework of the atom was disputed in the vault unit and also now we will focus on the function that electrons play in the development of compounds. Regardless of the kind of link or the number of atoms or electrons involved, it is the electron of those atom that interact to type a compound.
Electrons space not randomly arranged in an atom and their position within the atom deserve to be explained using electron arrangements, which space a streamlined version that electron configurations. For each element of interest, we look at the variety of electrons in a solitary atom and also then determine how those electrons room arranged based on the atom model. The main idea behind electron kinds is the electrons deserve to only exist at certain energy levels. By expertise the power levels of electron in one atom, we have the right to predict properties and also understand behavior of the atom.
As displayed in the figure below, there are multiple energy levels wherein electrons can be found. As the power level increases, the energy difference between them decreases. A maximum of two electrons can be found in the (n=1) level; eight electrons can be in the (n=2) level. Back the (n=3) and also (n=4) levels display only eight electron in this diagram, those power levels have the right to hold an ext but not till we begin looking in ~ the change metals. Us will only be involved with the electron species of facets through calcium (left( Z = 20 ight)) so we will put a best of eight electron in the (n=3) level and also two in the (n=4) level.
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The electron arrangement also shows the number of valence electron which is 2 for magnesium because there space two electrons in the (n=3) power level i m sorry is the highest possible occupied power level for magnesium. This corresponds to the (2+) charge formed when magnesium develops an ion. That is willing to lose 2 electrons so that it has actually the exact same electron arrangements together the nearest noble gas, which is neon (2, 8). Atom will acquire or lose electrons come look prefer the nearest noble gas due to the fact that the noble gases room unreactive as result of the security of having eight electrons in the highest energy level. This desire of atoms to have eight electron in your outermost shell is well-known as the octet rule.