Therefore, for the resulting compound to be neutral, two bromine anions must combine with one magnesium cation to form magnesium bromide (MgBr 2). In order to achieve noble gas configurations, the magnesium atom needs to lose its two valence electrons, while the bromine atom, which has 7 valence electrons, requires one additional electron to fill its outer shell. The ionic composition is then defined by the requirement that the resulting compound be electrically neutral overall.ДЇor example, to combine magnesium (Mg) and bromine (Br) to get an ionic compound, we first note the electronic configurations of these atoms (valence level in indicated in italics): The charge on the cations and anions is determined by the number of electrons required to achieve stable noble gas electronic configurations. On a macroscopic scale, ionic compounds, such as sodium chloride (NaCl), form a crystalline lattice and are solids at normal temperatures and pressures.Д¬rystalline LatticeSodium chloride crystal lattice electrically neutralA net charge of zero, which occurs when an atom or molecule/compound has no surplus or deficit of electrons.ДЄn ionic bond is formed through the transfer of one or more valence electrons, typically from a metal to a non-metal, which produces a cation and an anion that are bound together by an attractive electrostatic force.noble gasAny of the elements of group 18 of the periodic table, which are monatomic and, with very limited exceptions, inert, or non-reactive.empirical formulaThe simplest whole-number ratio between elements in a formula of a compound.polyatomic ionAn ion composed of several atoms.

The cation precedes the anion in both the written form and the formula.The number of cations and anions that are combined in an ionic compound is the simplest ratio of whole integers that can be combined to reach electrical neutrality.The charge on the cations and anions in an ionic compound can be determined by the loss or gain of valence electrons necessary in order to achieve stable, noble gas electronic configurations.

Ion bonding formula