You are watching: Which of the following pairs of elements is most likely to form a covalent bond?
Termselectronegativity: The tendency of an atom or molecule to entice electrons and type bonds.octet rule: atom lose, gain, or share electrons in bespeak to have actually a complete valence level that eight electrons. Hydrogen and helium space exceptions since they deserve to hold a preferably of 2 valence electrons.valence electrons: electrons in the outermost principal power (valence) level of an atom that have the right to participate in the formation of chemistry bonds with various other atoms.
Two great of Compounds
Compounds are defined as substances containing two or an ext different chemical elements. Castle have unique chemical structures defined by a fixed ratio of atoms held together by chemistry bonds. Here, we comment on two classes of compounds based on the bond type that holds the atom together: ionic and also covalent.
Covalent binding are identified by the share of electrons in between two or more atoms. These bonds largely occur in between nonmetals or in between two that the same (or similar) elements.Two atom with similar electronegativity will not exchange an electron from your outermost shell; the atoms instead share electrons so that their valence electron covering is filled.
Examples that compounds that contain only covalent bonds are methane (CH4), carbon monoxide (CO), and iodine monobromide (IBr).
Ionic bonding occurs once there is a large difference in electronegativity between two atoms. This big difference leads to the lose of one electron native the much less electronegative atom and the get of that electron by the more electronegative atom, resulting in two ions. These oppositely charged ions feel one attraction to every other, and also this electrostatic attraction constitutes one ionic bond.
Ionic bonding occurs in between a nonmetal, i m sorry acts as an electron acceptor, and a metal, which acts together an electron donor. Metals have few valence electrons, vice versa, nonmetals have closer to eight valence electrons; to conveniently satisfy the octet rule, the nonmetal will certainly accept an electron donated by the metal. Much more than one electron deserve to be donated and also received in an ionic bond.
Some examples of compounds through ionic bonding include NaCl, KI, MgCl2.Formation of salt fluoride (NaF)The carry of an electron indigenous a neutral sodium atom to a neutral fluorine atom creates two oppositely fee ions: Na+ and F–. Attraction that the oppositely charged ions is the ionic bond in between Na and also F.
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Effect on physics Properties
Covalent and ionic compounds deserve to be differentiated easily because of their different physical properties based on the nature of their bonding. Below are some differences:At room temperature and also normal atmospheric pressure, covalent compounds might exist as a solid, a liquid, or a gas, vice versa, ionic link exist only as solids.Although hard ionic compounds execute not command electricity since there room no cost-free mobile ion or electrons, ionic compounds liquified in water do an electrically conductive solution. In contrast, covalent compounds execute not exhibit any kind of electrical conductivity, one of two people in pure form or when dissolved in water.Ionic compounds exist in stable crystalline structures. Therefore, they have greater melting and also boiling points compared to covalent compounds.
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