You are watching: Which statement about covalent compounds is true?
Termselectronegativity: The propensity of one atom or molecule to lure electrons and kind bonds.octet rule: atoms lose, gain, or share electrons in stimulate to have a complete valence level of eight electrons. Hydrogen and also helium space exceptions due to the fact that they deserve to hold a best of 2 valence electrons.valence electrons: electron in the outermost principal energy (valence) level of an atom that have the right to participate in the development of chemistry bonds with other atoms.
Two great of Compounds
Compounds are characterized as building materials containing 2 or much more different chemical elements. Castle have unique chemical structures identified by a fixed ratio of atoms hosted together by chemistry bonds. Here, we comment on two great of compounds based on the bond form that holds the atom together: ionic and covalent.
Covalent bond are identified by the sharing of electrons between two or an ext atoms. This bonds largely occur between nonmetals or between two that the same (or similar) elements.Two atoms with comparable electronegativity will not exchange an 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 as soon as there is a large difference in electronegativity between two atoms. This big difference leads to the loss of an electron native the much less electronegative atom and also the obtain of the electron by the an ext electronegative atom, bring about two ions. These oppositely charged ions feel one attraction to every other, and this electrostatic attraction constitutes an ionic bond.
Ionic bonding occurs between a nonmetal, i beg your pardon acts as an electron acceptor, and a metal, i m sorry acts as an electron donor. Steels have few valence electrons, conversely, nonmetals have actually closer come eight valence electrons; to easily satisfy the octet rule, the nonmetal will accept one electron donated by the metal. More than one electron deserve to be donated and received in an ionic bond.
Some instances of compounds with ionic bonding encompass NaCl, KI, MgCl2.Formation of salt fluoride (NaF)The transport of one electron native a neutral salt atom come a neutral fluorine atom creates two oppositely charge ions: Na+ and F–. Attraction of the oppositely charged ion 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 distinguished easily due to the fact that of their various physical properties based on the nature of their bonding. Right here are some differences:At room temperature and also normal atmospheric pressure, covalent compounds might exist together a solid, a liquid, or a gas, vice versa, ionic link exist only as solids.Although solid ionic compounds perform not conduct electricity since there room no complimentary mobile ion or electrons, ionic compounds dissolved in water make an electrically conductive solution. In contrast, covalent compounds execute not exhibit any electrical conductivity, either in pure kind or when liquified in water.Ionic compounds exist in secure crystalline structures. Therefore, castle have higher melting and boiling points compared to covalent compounds.
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