Using only the elements P, Br, and Mg, give formulas for the following. (b) A molecular compound with polar covalent bonds that obeys the octet rule and has no formal charges

검증된 단계별 안내

insert step 1> Identify the elements involved: Phosphorus (P), Bromine (Br), and Magnesium (Mg).

insert step 2> Recognize that a molecular compound typically involves nonmetals, so focus on P and Br, as Mg is a metal.

insert step 3> Consider the valence electrons: P has 5 valence electrons, and Br has 7 valence electrons.

insert step 4> Aim to form a compound where each atom achieves an octet. Phosphorus can form three bonds to achieve an octet, while each Bromine can form one bond.

insert step 5> Construct a compound where Phosphorus is central and forms three single bonds with three Bromine atoms, resulting in the formula PBr3.

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주요 개념

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Polar Covalent Bonds

Polar covalent bonds occur when two atoms with different electronegativities share electrons unequally, resulting in a molecule with a partial positive charge on one end and a partial negative charge on the other. This uneven distribution of charge creates a dipole moment, which is essential for determining the polarity of the compound.

Octet Rule

The octet rule states that atoms tend to form bonds in such a way that they each have eight electrons in their valence shell, achieving a stable electron configuration similar to that of noble gases. This rule is a guiding principle in predicting the formation of molecular compounds, particularly in covalent bonding.

Formal Charges

Formal charge is a theoretical charge assigned to an atom in a molecule, calculated based on the number of valence electrons, the number of non-bonding electrons, and half the number of bonding electrons. A molecule with no formal charges is often more stable, as it indicates that the electrons are distributed in a way that minimizes charge separation.