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tht means the max no. of electrons in the first shell is 2. the max no. of electrons in the second shell is 8. and the max number of electrons in the third shell is 8....it goes on as the no. of electron in the atom increases. so the electron configuration for magnesium is 2.8.2. this shows tht the first and second shells are filled to the max. the third shell isn't. it has a 2+ charge because it has lost 2 electrons( which carries a negative charge), hence the atom is more positive than normal.
What is the cost of magnesium in pounds? The cost of Magnesium per pound is $2.45 per pound. The price will vary depending upon the purity and the form of the magnesium required, and the quantity being purchased, (aâ¦s buying in bulk tends to result in a lower price for a given mass of product). The chemical supplier Sigma Aldrich will give prices for various forms of magnesium and in various quantities. As an example: 500g of granular, reagent grade, 98% pure magnesium would cost Â£43 (GBP) 2kg of granular, reagent grade, 98% pure magnesium would cost Â£144.10 (GBP) 5 people found this useful.