Each ion, with square-brackets that separate each Lewis structure from the overall charge written at the top-right of the brackets, as shown here:
Covalent and ionic bonding in (NH4)2SO4.
2.) Use the methods described above to draw Lewis structures for the following formulas. For NH2 how do you do this

According to the vsepr theory what is the shape of a molecule that has a central atom valence three other items with no lone pairs of electrons

What is a possible quantum number set for an electron in the 3s orbital of a magnesium atom

Tooth enamel consists mainly of the mineral calcium hydroxyapatite, ca_10(po_4)_6(oh)_2. trace elements in teeth of archaeological specimens provide anthropologist with clues about diet and diseases of ancient people. students at hamline university measured strontium in enamel from extracted wisdom teeth by atomic absorption spectroscopy. solutions with a constant total volume of 10.0 ml contained 0.726 mg of dissolved tooth enamel plus variable concentrations of added sr. added sr find the concentration of sr in the 10 ml sample solution in parts per billion = ng/ml. find the concentration of sr in tooth enamel in parts per million = mu g/g.