What is it meant by a fundamental unit?

Each of the following compounds contains a metal that can exhibit more than one ionic charge. provide systematic names for each of these compounds. (a) cr(clo3)6 (b) mo(cn)6 (c) cr2(so3)3 (d) v(clo2)2 (e) v(cn)5 (f) os(clo2)4

Which diagram shows the correct way to represent an ionic compound of magnesium oxide?

650.j is the same amount of energy as? 2720cal1550cal650.cal2.72cal