You are watching: Which of the following is true about the composition of ionic compounds?
Termselectronegativity: The tendency of an atom or molecule to lure electrons and create bonds.octet rule: Atoms lose, obtain, or share electrons in order to have actually a full valence level of eight electrons. Hydrogen and helium are exceptions because they have the right to organize a maximum of 2 valence electrons.valence electrons: Electrons in the outermost principal power (valence) level of an atom that can participate in the formation of chemical bonds through various other atoms.
Two Classes of Compounds
Compounds are defined as substances containing 2 or more different chemical elements. They have actually distinct chemical frameworks identified by a addressed ratio of atoms organized together by chemical bonds. Here, we discuss 2 classes of compounds based upon the bond form that holds the atoms together: ionic and also covalent.
Covalent bonds are characterized by the sharing of electrons in between 2 or more atoms. These bonds mainly take place between nonmetals or in between two of the very same (or similar) facets.Two atoms via comparable electronegativity will not exchange an electron from their outerthe majority of shell; the atoms instead share electrons so that their valence electron shell is filled.
Examples of compounds that contain only covalent bonds are methane (CH4), carbon monoxide (CO), and also iodine monobromide (IBr).
Ionic bonding occurs when tright here is a big distinction in electronegativity in between two atoms. This huge distinction leads to the loss of an electron from the much less electronegative atom and also the gain of that electron by the more electronegative atom, causing two ions. These oppositely charged ions feel an attraction to each other, and also this electrostatic attraction constitutes an ionic bond.
Ionic bonding occurs in between a nonsteel, which acts as an electron acceptor, and also a metal, which acts as an electron donor. Metals have few valence electrons, whereas nonsteels have closer to eight valence electrons; to easily satisfy the octet dominion, the nonsteel will certainly accept an electron donated by the metal. More than one electron can be donated and also got in an ionic bond.
Some examples of compounds via ionic bonding encompass NaCl, KI, MgCl2.Formation of sodium fluoride (NaF)The transfer of an electron from a neutral sodium atom to a neutral fluorine atom creates 2 oppositely charge ions: Na+ and F–. Attractivity of the oppositely charged ions is the ionic bond between Na and F.
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Effect on Physical Properties
Covalent and also ionic compounds can be distinguished conveniently bereason of their various physical properties based on the nature of their bonding. Here are some differences:At room temperature and normal atmospheric pressure, covalent compounds may exist as a solid, a liquid, or a gas, whereas ionic compounds exist only as solids.Although solid ionic compounds perform not conduct electrical energy because tright here are no complimentary mobile ions or electrons, ionic compounds liquified in water make an electrically conductive solution. In contrast, covalent compounds perform not exhibit any kind of electric conductivity, either in pure form or when dissolved in water.Ionic compounds exist in steady crystalline structures. Therefore, they have higher melting and also boiling points compared to covalent compounds.
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