Combine a metal from g roup 2 with a non metal from group 7 and describe electrons arangement
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You can select Magnesium from the 2nd group of periodic table and Chlorine from the 7th group of halogens of periodic table and combine them to form magnesium chloride `MgCl_2` .
Since Magnesium has two electrons on its outer shell, it donates them to two chlorine atoms becoming a magnesium positive ion.
Since chlorine has 7 atoms in its outer shell, it accepts the two electrons provided by the Magnesium atom, becoming a stable ion whose electronic structure is like the structure of the noble gas argon.
The ionic formula of magnesium chloride is `Mg^(2+)(Cl^-)_2` .
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