The melting points of the oxides of the third-period elements are given in parentheses: Na2O (1275°C), MgO (2800°C), Al2O3 (2045°C), SiO2 (1610°C), P4O10 (580°C), SO3 (16.8°C), Cl2O7 (91.5°C). Classify these solids in terms of crystal types.A) Na2O: ionic covalent molecular metallicB) MgO: ionic covalent molecular metallicC) Al2O3: ionic covalent molecular metallicD) SiO2: ionic covalent molecular metallicE) P4O10: ionic covalent molecular metallicF) SO3: ionic covalent molecular metallicG) Cl2O7: ionic covalent molecular metallic

The ionic crystals are formed when a metal loses electrons, forming a cation, and a nonmetal gains those electrons, forming an anion. The covalent crystals are those in that two nonmetals share pairs of electrons, and when they are large, it's called a molecular crystal. The metallic crystals are those formed by metals only.

A) Na is metal and O is a nonmetal, so it's ionic.

B) Mg is metal and O is a nonmetal, so it's ionic.

C) Al is metal and O is a nonmetal, so it's ionic.

D) Both Si and O are nonmetals, so it's covalent.

E) Both P and O are nonmetals, but the crystal has a large number of atoms, so it's molecular.

F) Both S and O are nonmetals, so it's covalent.

G) Both Cl and O are nonmetals, so it's covalent.

ahsan57900 ahsan57900 · Answer 2 · 2022-02-03T13:54:14+01:00

Classification of solids on the basis of their crystal types are the following:

A) Ionic, B) Ionic, C) Ionic, D) Covalent, E) Molecular, F) Covalent, G) Covalent

What are ionic, covalent and molecular solids?

The ionic crystals are formed when a metal loses electrons, forming a cation, and a nonmetal gains those electrons, forming an anion.
The covalent crystals are those in that two nonmetals share pairs of electrons, and when they are large, it's called a molecular crystal.
The metallic crystals are those formed by metals only.

Na is metal and O is a nonmetal, so it is ionic in nature. Mg is metal and O is a nonmetal, so it is also an ionic. Al is metal and O is a nonmetal, so it's ionic in nature.

Both Si and O are nonmetals, so it formed covalent solid. Both P and O are nonmetals, but the crystal has a large number of atoms, so it made molecular solid. Both S and O are nonmetals, so it formed covalent solid. Cl and O are also nonmetals, so it formed covalent.

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