Concept explainers
Interpretation:
“Delta plus” symbol is assigned to what type of atom in a polar covalent bond has to be chosen from the given options.
Concept Introduction:
Close relationship between ionic and covalent bonding models becomes apparent if the bond polarity and electronegativity is considered. Electronegativity is the measure of relative attractive for the shared pair of electrons in a bond. Higher the electronegative value for an atom, the more it attracts the shared pair of electrons towards itself.
In Periodic table, when moving from left to right in a period, the electronegativity value increases. While moving from top to bottom within group, the electronegativity value decreases. Nonmetals have higher electronegativity values than metals. Metals gives electrons and nonmetals accepts electrons.
Bond polarity is the degree of inequality in the electron pair sharing between two atoms in a
The ionic and covalent bonds can be identified by using the electronegativity difference between the atoms that are bonded together.
- Bonds that are formed between two similar electronegative atoms are known as nonpolar covalent bonds. The electronegativity difference has to be 0.4 or less.
- The bonds that have electronegativity difference greater than 0.4 and lesser than 1.5 are known as polar covalent bonds.
- If the electronegativity difference is more than 2.0, then the bond is considered to be ionic.
- If the electronegativity difference is between 1.5 to 2.0, then the bond can be ionic or covalent depending upon the type of atoms that is bonded. If the bond is between a metal and nonmetal, then it is ionic and if it is between two nonmetals then it is polar covalent.
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Chapter 5 Solutions
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