â Free marketâ is a summary term for an array of exchanges that take place in society. Each exchange is undertaken as a voluntary agreement between two people or between groups of people represented by agents. These two individuals (or agents) exchange two economic goods, either tangible commodities or nontangible services.
Magnesium - Mg. Chemical properties of magnesium - Health effects of magnesium - Environmental effects of magnesium. Magnesium. Chemical element, metallic, symbol Mg, situated in group IIa in the periodic table, atomic number: 12, atomic weight: 24,312. Magnesium is silvery white and very light. Its relative density is 1,74 and itâs density 1740 kg/m3 (0.063 lb/in3 or 108.6 lb/ft3).
Your starting point for finding the electron configuration of the magnesiu mcation, #Mg^(2+)#, will be the electron configuration of the neutral magnesium atom, #Mg#. You know that magnesium is located in period 3, group 2 of the periodic table, and that it has an atomic number equal to #12#. This means that a neutral magnesium atom will have a total of #12# protons in its nucleus and #12# electrons surrounding its nucleus. Its electron configuration would look like this. #Mg:  1s^2 2s^2 2p^2 3s^2#. Now, when the magnesium cation is formed, two electrons, hence the #2+# charge of the cation, are lost by the mgnesium atom. These electrons, which are called valence electrons, come from magnesium's outermost energy level.