Dont click any of the links people post
I wanna say it would be 1 would be A 2 would be C 3 would be D 4 would be B and 5 would be E
hope this helps
Using electronegativity difference is a good guide to the ionic/ covalent nature. Large differences indicate greater ionic character, small differences more covalent character. The larger the difference in electronegativity the more ionic properties a bond is said to have. The smaller the difference in electronegativity the more covalent properties a bond is said to have.
Ionic bonding is formed through electrostatic attraction between a cation and anion. Foe example, Sodium fluoride has ionic bonding because it is composed by sodium and Fluorine (a non metal). On the other hand, covalent bonding is characterized by atoms sharing pairs of electrons. For example; methane has covalent bonding; carbon has 4 valence electrons and hydrogen has 1; when they bond they have a total of 8 electrons and satisfies the octet rule.
Answer:
When the metal of the ionic compound has multiple oxidation states.
Explanation:
Nickel (Ni - At No 28) has multiple oxidation states* => −2, −1, 0, +1,[2] +2, +3, +4[3] (a mildly basic oxide)*. When naming compound of nickel on needs to include a roman numeral in parenthesis after the symbol of the element in order to identify which oxidation state is relevant.
examples
Nickel Halide derivatives include
NiCl => nickel(I) chloride
NiCl₂ => nickel(II) chloride
NiCl₃ => nickel (III) chloride
Such is important in that each of the compounds have different physical and chemical properties due to variations in oxidation states of nickel.
https://en.wikipedia.org/wiki/Nickel
126.751 g/mol
Formula: FeCl2
