You are watching: Distinguish the properties of ionic and molecular compounds
Termselectronegativity: The tendency of an atom or molecule to entice electrons and develop bonds.octet rule: Atoms lose, gain, or share electrons in order to have actually a complete valence level of eight electrons. Hydrogen and also helium are exceptions bereason they can hold a maximum of two valence electrons.valence electrons: Electrons in the outermany major energy (valence) level of an atom that have the right to get involved in the formation of chemical bonds via other atoms.
Two Classes of Compounds
Compounds are characterized as substances containing 2 or even more various chemical aspects. They have actually distinctive chemical frameworks defined by a addressed proportion of atoms organized together by chemical bonds. Here, we discuss 2 classes of compounds based on the bond type that holds the atoms together: ionic and also covalent.
Covalent bonds are identified by the sharing of electrons in between two or more atoms. These bonds mostly happen in between nonsteels or in between two of the very same (or similar) facets.Two atoms with equivalent electronegativity will not exchange an electron from their outermost shell; the atoms instead share electrons so that their valence electron shell is filled.
Examples of compounds that contain just covalent bonds are methane (CH4), carbon monoxide (CO), and also iodine monobromide (IBr).
Ionic bonding occurs once tbelow is a big difference in electronegativity in between 2 atoms. This big distinction leads to the loss of an electron from the much less electronegative atom and also the acquire of that electron by the even more electronegative atom, resulting in two ions. These oppositely charged ions feel an attractivity to each various other, and also this electrostatic attractivity constitutes an ionic bond.
Ionic bonding occurs between a nonsteel, which acts as an electron acceptor, and a steel, which acts as an electron donor. Metals have actually few valence electrons, whereas nonsteels have actually closer to eight valence electrons; to quickly meet the octet rule, the nonmetal will accept an electron donated by the metal. More than one electron have the right to be donated and received in an ionic bond.
Some examples of compounds via ionic bonding incorporate NaCl, KI, MgCl2.Formation of sodium fluoride (NaF)The transport of an electron from a neutral sodium atom to a neutral fluorine atom creates 2 oppositely charge ions: Na+ and F–. Attraction of the oppositely charged ions is the ionic bond between Na and F.
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Effect on Physical Properties
Covalent and ionic compounds deserve to be identified easily because of their different physical properties based on the nature of their bonding. Here are some differences:At room temperature and normal atmospheric push, covalent compounds may exist as a solid, a liquid, or a gas, whereas ionic compounds exist only as solids.Although solid ionic compounds carry out not conduct electrical energy bereason tright here are no free mobile ions or electrons, ionic compounds dissolved in water make an electrically conductive solution. In comparison, covalent compounds execute not exhilittle bit any type of electric conductivity, either in pure create or as soon as dissolved in water.Ionic compounds exist in stable crystalline structures. Because of this, they have better melting and boiling points compared to covalent compounds.
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