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When electrons are contributed by one at...

When electrons are contributed by one atom but shared by both the atoms so as to complete their octets, the bond formed is called

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Coordinate bond or dative bond
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The number of electrons lost or gained by an atom so as to complete the octet is called ________

Assertion : The number of electrons gained, lost or shared by the atom of an element so as to complete its octet is called the valency of the element. Reason : Elements having the same number of valence electrons in their atoms possess different chemical properties.

Knowledge Check

  • Consider the following statements about coordinate bonding electron. In coordinate bonding shared electron pair is donated by one atom and shared by both the atoms. Coordinate linkage is rigid and directional, thus they exhibit isomerism. Select the correct option.

    A
    Only I
    B
    Only II
    C
    I and II
    D
    None of these

  • Sidgwick proposed that an atom contributes both the electrons for mutual sharing and that electron pair is shared by the two atoms. Such a covalent bond is called coordinate covalent bond or dative bond. The atom or ion or molecule, which donates the electron pair, is called donor. The atom or ion or molecule, which accepts the electron pair, is called acceptor. Coordinate bond is represented by arrow pointing from

    A
    acceptor to donor atom
    B
    donor to acceptor atom
    C
    neutral to charged atom
    D
    none of these.

  • Sidgwick proposed that an atom contributes both the electrons for mutual sharing and that electron pair is shared by the two atoms. Such a covalent bond is called coordinate covalent bond or dative bond. The atom or ion or molecule, which donates the electron pair, is called donor. The atom or ion or molecule, which accepts the electron pair, is called acceptor. Molecule in which coordinate bond is present is

    A
    `O_3`
    B
    `H_3O^(+)`
    C
    `H_2O`
    D
    both (a) and (b)

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    The bond formed by sharing of electron pair is contributed by one of the two bonded atoms is known as

    When two atoms share two electron pairs, they are said to be joined by a

    Answer question on the basis of your understanding of the following paragraph and related studied concepts. Sodium atom has one electron in the outermost shell. If it loses the electron from its M-shell, then it L-shell now becomes the outermost shell and that has a stable octet. The nucleus of this atom still has 11 protons but the number of electrons has become 10, so there is a net positive charge giving us a sodium cation Na^+ . On the other hand, chlorine provides us a negative ion, Cl^- by gaining the electron from Na atom. In this way the octet of Cl is also completed. These two atoms have a give and-take relationship. Thus Na^+ and Cl^- being oppositely charged in nature form a bond between them called ionic bond. The compounds obtained in this manner are called ionic compounds. Show the formation of bond between Na and F.

    Sidgwick proposed that an atom contributes both the electrons for mutual sharing and that electron pair is shared by the two atoms. Such a covalent bond is called coordinate covalent bond or dative bond. The atom or ion or molecule, which donates the electron pair, is called donor. The atom or ion or molecule, which accepts the electron pair, is called acceptor. The melting and boiling points of coordinate compound are ____ ionic compounds and covalent compound.

    If the electron pair forming a bond between two atoms and B is not in the center then the bond is ?

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