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  1. exemples of elements with 1 valence electron: Hydrogen, lithium, potassium.

    exemples of elements with 2 valence electrons: magnessium, calcium.

    boron has 3 valence electrons. Phosphorus has 5 valence electrons.

    carbon has 4 valence electrons.

    exemples of elements with 5 valence electrons: Phosphorus, nitrogen

    exemples of elements with 7 valence electrons: fluorine, chlorine

    exemples of elements with 8 valence electrons: helium, argon


    the easiest way to know the number of electrons are by the number of the group so 14 is 4, 16 is 6.

  2. answer: [tex]2c_5h_5+1fe\rightarrow 1fe(c_5h_5)_2[/tex]

    the reaction is type of combination reaction.


    [tex]? c_5h_5+? fe\rightarrow ? fe(c_5h_5)_2[/tex]

    on the product side, there are 2 molecules of [tex]c_5h_5[/tex] bonded to fe   which means one atom of fe are combined two molecules of [tex]c_5h_5[/tex]. so, balanced chemical equation becomes :

    [tex]2c_5h_5+1fe\rightarrow 1fe(c_5h_5)_2[/tex]

    this reaction follows the reaction type of combination reaction. a combination reaction is defined as chemical reaction in which reactants combines together to form a single product.

    [tex]a+b\rightarrow ab[/tex]

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