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First, it is not strictly true, but it may be because covalent bonds are between two non-metals and ionic bonds are between a non-metal and a metal. Most non-metals are in the top right of the Periodic Table, and so have lighter atomic weights, whereas metals take up most of the periodic table and so in general are heavier than non-metals (with obvious exceptions such as the very light metal lithium for instance). Also ionic compounds tend to have a long range bonding structure and because of the nature of ionic bonds tend to be tightly packed. Covalent molecules, while the atoms are tightly "packed" in the molecule, the molecules are not so tightly packed against one another, leaving more empty space, and thus reducing the density.

Also, what may cause the added space between the covalently bonded molecules is that fact that the molecular bonds are highly directional (which in many instances causes assymetric molecules) where ionic and metallic bonds are non-directional. This can reduce intermolecular attractions to only weak van der waals forces.

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Why CuS is covalent compound while CuO is ionic compound?

Not sure about your examples but electronegativity variance is a good rule of thumb for deciding ionic from covalent bonds. Electronegativity variance less than 1.4, generally much less, indicates a covalent bonding. Electronegativity variance greater than 1.4 indicates ionic bonding.


Why might metallic bonding be weak compared to ionic and covalent bonding?

Metallic bonding is weaker than ionic and covalent bonding because metallic bonds result from the attraction between positively charged metal ions and delocalized electrons, which are not held as tightly as valence electrons in covalent or ionic bonds. Additionally, metallic bonds are less directional compared to covalent bonds, resulting in weaker interactions between atoms.


Are chemical bonds mostly covalent?

No they aren't..sugdens singleton linkages,ionic bonds or electrostatic forces of attraction,odd electron bonding,co ordinate bonding are some of the various other types.but covalent bonding is seen quite often.


Ionic bonding vs covalent bonding?

An Ionic bond is one where an element gives away electrons to another, forming Ions. It usually occurs between metals and nonmetals. Another way to tell is if the electronegativity difference between the elements is greater than 2.0 then it is an ionic bond. A covalent bond is one where the elements share electrons with one another. It usually occurs between nonmetals. If the electronegativity difference between the elements is 2.0 or less it is a covalent bond.


Atoms of metallic elements can form ionic bonds but they are not very good at forming covalent bonds. Why?

they have a great tendency to lose electrons


Which type of bond involves a transfer of electrons from one atom to another?

an ionic bond involves a transfer of electrons from the less electronegative atom(s) to the more elect. neg. atom(s) to form charged ions that interact with each other by columbic forces ionic, covalent, polar covalent


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An ionic bond is expected between K and Br.


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One way to determine if a bond is ionic or covalent is to look at the electronegativity difference between the two atoms. If the difference is large (greater than 1.7), the bond is likely ionic. If the difference is small (less than 1.7), the bond is likely covalent. Additionally, ionic bonds typically form between a metal and a nonmetal, while covalent bonds form between two nonmetals.


Why are covalent bonds more volatile than ionic bonds?

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What is the significance of an electronegativity difference of 1.7 and 2 atoms?

2 - 1.7 = 0.3 Not much difference. This implies that these two elements will form a nonpolar covalent bond with each other. Greater than 1.4 variance and you are probably looking at an ionic bonding. Less than 1.4 is covalent, but too great a variance that does not exceed 1.4 is likely a poplar covalent bonding.


How is electronegativity used in determining the ionic or covalent character of the bonding?

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