You are watching: Which statement is true about ionic compounds?
Termselectronegativity: The tendency of an atom or molecule to tempt electrons and also form bonds.octet rule: Atoms shed, get, or share electrons in order to have a complete valence level of eight electrons. Hydrogen and also helium are exceptions bereason they have the right to hold a maximum of 2 valence electrons.valence electrons: Electrons in the outera lot of principal energy (valence) level of an atom that have the right to participate in the formation of chemical bonds through other atoms.
Two Classes of Compounds
Compounds are defined as substances containing two or even more different chemical facets. They have distinctive chemical frameworks defined by a solved proportion of atoms hosted together by chemical bonds. Here, we discuss two classes of compounds based on the bond type that holds the atoms together: ionic and also covalent.
Covalent bonds are defined by the sharing of electrons in between 2 or more atoms. These bonds mainly take place between nonsteels or in between two of the same (or similar) aspects.Two atoms with equivalent electronegativity will not exreadjust an electron from their outermost shell; the atoms instead share electrons so that their valence electron shell is filled.
Instances of compounds that contain only covalent bonds are methane (CH4), carbon monoxide (CO), and also iodine monobromide (IBr).
Ionic bonding occurs as soon as tbelow is a large difference in electronegativity between 2 atoms. This huge distinction leads to the loss of an electron from the less electronegative atom and the obtain of that electron by the even more electronegative atom, bring about 2 ions. These oppositely charged ions feel an attraction to each other, and this electrostatic attraction constitutes an ionic bond.
Ionic bonding occurs in between a nonsteel, which acts as an electron acceptor, and a metal, which acts as an electron donor. Metals have few valence electrons, whereas nonsteels have actually closer to eight valence electrons; to conveniently fulfill the octet preeminence, the nonmetal will certainly accept an electron donated by the metal. More than one electron can be donated and also obtained in an ionic bond.
Some examples of compounds through ionic bonding encompass NaCl, KI, MgCl2.Formation of sodium fluoride (NaF)The move of an electron from a neutral sodium atom to a neutral fluorine atom creates 2 oppositely charge ions: Na+ and also F–. Attraction of the oppositely charged ions is the ionic bond in between Na and also F.
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Effect on Physical Properties
Covalent and also ionic compounds deserve to be identified easily bereason of their various physical properties based upon the nature of their bonding. Here are some differences:At room temperature and normal atmospheric pressure, covalent compounds might exist as a solid, a liquid, or a gas, whereas ionic compounds exist just as solids.Although solid ionic compounds perform not conduct power because there are no cost-free mobile ions or electrons, ionic compounds dissolved in water make an electrically conductive solution. In comparison, covalent compounds execute not exhilittle any electrical conductivity, either in pure develop or as soon as dissolved in water.Ionic compounds exist in stable crystalline structures. Thus, they have actually greater melting and boiling points compared to covalent compounds.
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