Which of the following compounds would yoou expect to be ionic?A) NH3B)C2H6C) LiBrD) H2O2E) noneFor me all the compounds look like an ionic compound, since each of them consist of a metal and a nonmetal. A) NH3 - Nitrogen (nonmetal) + Hydrogen (alkali-metal)B)C2H6 - Carbon (nonmetal) + Hydrogen (alkali-metal)C) LiBr - Lithium (alkali-metal) + Bromine (nonmetal)D) H2O2 - Hydrogen (alkali-metal) + Oxygen (nonmetal)Where am I wrong? Thank you!

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Asked Oct 13, 2019
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Which of the following compounds would yoou expect to be ionic?

A) NH3

B)C2H6

C) LiBr

D) H2O2

E) none

For me all the compounds look like an ionic compound, since each of them consist of a metal and a nonmetal.

A) NH3 - Nitrogen (nonmetal) + Hydrogen (alkali-metal)

B)C2H6 - Carbon (nonmetal) + Hydrogen (alkali-metal)

C) LiBr - Lithium (alkali-metal) + Bromine (nonmetal)

D) H2O2 - Hydrogen (alkali-metal) + Oxygen (nonmetal)

Where am I wrong? Thank you!

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Expert Answer

Step 1

Ionic bond is formed by the complete transfer of valence electron(s) between atoms. It is a type of chemical bond that generates two oppositely charged ions. In ionic bonds, the metal loses electrons to become a positively charged cation, whereas the non-metal accepts those electrons to become a negatively charged anion. This bonding occurs between a metal and a non-metal.

Covalent bond is formed by the sharing of electrons between the two atoms. This bonding occurs primarily between non-metals; however, covalent bond can also be observed between non-metals and metals.

Also, mostly the bonds between the atoms are formed in such a say so as to fulfil their octet rule, that is, an atom must have 8 electrons in their valence shell after forming a bond. The main exception to the rule is hydrogen, lithium and beryllium, in which there must be 2 electrons in its valence or the last shell.

Step 2

(a) In NH3, N atom has five valence electrons and H has one valence electron. So, N atom shares its three valence electrons with three H atoms to fulfil their octet rule. Sharing of valence electrons lead to formation of covalent bond among nitrogen and hydrogen atoms.

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N н: Н н

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Step 3

(b) In C2H6, C atom has four valence electrons and H has one valence electron. So, each C atom shares its four valence electrons with three H atoms and one C atom...

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н Н н: с : н С н H.

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