Given the number of a substance, we can solve the number of moles by using a conversion factor that would relate the number of a substance to the number of moles. In any case, Avogadro's number would be used. It <span>represents the number of
units in one mole of any substance. This has the value of 6.022 x 10^23 units /
mole. This number can be used to convert the number of atoms or molecules into
number of moles. For example, we are given 1.23 x 10^24 atoms of a substance converting it to moles we do as follows:
</span>1.23 x 10^24 atoms ( 1 mol / 6.022x10^23 atoms ) = 2.04 moles
A species that is isoelectronic with the oxide ion will have the same electron configuration of electrons as as the oxide ion.
4 species that are isoelectronic with the oxide ion are F^(-), Ne, Na^(+), and Mg^(2+).
All of the electron configuration of these ions end at 2p⁶.
Al belongs to group III elements in periodic table so it forms Al3+ ion. check w the formula Al2O3: 2x(+3) from Al = +6 which equal to 3x(-2) from O. so its balanced.
Al ionizes from neutral to Al3+ and 3 e- to bond w O.
Only magnesium because unlike the other three metals it is located above zinc in the reactivity series