You are watching: Which of these pairs of elements would be most likely to form an ionic compound?
Termselectronegativity: The propensity of an atom or molecule to lure electrons and kind bonds.octet rule: atom lose, gain, or share electrons in stimulate to have a complete valence level the eight electrons. Hydrogen and helium are exceptions due to the fact that they have the right to hold a preferably of 2 valence electrons.valence electrons: electrons in the outermost principal power (valence) level of an atom that can participate in the development of chemistry bonds with various other atoms.
Two classes of Compounds
Compounds are identified as building material containing 2 or much more different chemistry elements. Castle have unique chemical structures identified by a fixed ratio of atoms hosted together by chemistry bonds. Here, we comment on two class of compounds based upon the bond type that stop the atom together: ionic and also covalent.
Covalent bonds are characterized by the sharing of electrons in between two or more atoms. This bonds largely occur in between nonmetals or between two the the same (or similar) elements.Two atoms with comparable electronegativity will certainly not exchange one electron from your outermost shell; the atoms instead share electrons so that their valence electron covering is filled.
Examples of compounds that contain just covalent bonds are methane (CH4), carbon monoxide (CO), and also iodine monobromide (IBr).
Ionic bonding occurs when there is a big difference in electronegativity in between two atoms. This large difference leads to the loss of one electron indigenous the much less electronegative atom and the acquire of the electron by the much more electronegative atom, resulting in two ions. This oppositely charged ions feel an attraction to every other, and also this electrostatic attraction constitutes an ionic bond.
Ionic bonding occurs between a nonmetal, i m sorry acts as an electron acceptor, and a metal, which acts as an electron donor. Steels have few valence electrons, conversely, nonmetals have actually closer come eight valence electrons; to quickly satisfy the octet rule, the nonmetal will certainly accept one electron donated by the metal. An ext than one electron deserve to be donated and also received in an ionic bond.
Some examples of compounds v ionic bonding encompass NaCl, KI, MgCl2.Formation of salt fluoride (NaF)The carry of one electron indigenous a neutral salt atom to a neutral fluorine atom creates 2 oppositely charge ions: Na+ and F–. Attraction that the oppositely charged ions is the ionic bond between Na and F.
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Effect on physical Properties
Covalent and ionic compounds have the right to be identified easily due to the fact that of their various physical properties based upon the nature of their bonding. Right here are some differences:At room temperature and normal atmospheric pressure, covalent compounds might exist as a solid, a liquid, or a gas, conversely, ionic link exist only as solids.Although heavy ionic compounds execute not command electricity since there room no complimentary mobile ions or electrons, ionic compounds dissolved in water do an electrically conductive solution. In contrast, covalent compounds perform not exhibit any electrical conductivity, one of two people in pure form or when liquified in water.Ionic compounds exist in steady crystalline structures. Therefore, they have greater melting and also boiling points compared to covalent compounds.
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