Identify all substances that can be classified as an atomic solid.

SeF6

C2H4O2

H2C2O4

S8

Ru

La2(SO4)3

None

To identify substances that can be classified as an atomic solid, we need to understand what atomic solids are. Atomic solids are solids composed of individual atoms held together by strong metallic, covalent, or diatomic forces.

Let's analyze each substance provided to see if it can be classified as an atomic solid:

1. SeF6: SeF6 is not an atomic solid as it is a molecular compound composed of selenium and six fluorine atoms. It consists of discrete molecules held together by intermolecular forces.

2. C2H4O2: C2H4O2, also known as acetic acid, is not an atomic solid. It is a molecular compound composed of carbon, hydrogen, and oxygen. It exists as discrete molecules held together by intermolecular forces.

3. H2C2O4: H2C2O4, also known as oxalic acid, is not an atomic solid. Similar to acetic acid, it is a molecular compound composed of carbon, hydrogen, and oxygen. It exists as discrete molecules held together by intermolecular forces.

4. S8: S8, also known as sulfur, can be classified as an atomic solid. It consists of individual sulfur atoms covalently bonded together to form a solid lattice structure.

5. Ru: Ru, also known as ruthenium, is not an atomic solid. Ruthenium is a transition metal and typically exists as metallic solids composed of closely-packed metal atoms. However, since we do not have further information about the form or composition of ruthenium, we cannot determine if it is an atomic solid based solely on its chemical symbol.

6. La2(SO4)3: La2(SO4)3, also known as lanthanum sulfate, is not an atomic solid. It is an ionic compound composed of lanthanum cations (La3+) and sulfate anions (SO4²-). ionic compounds are composed of charged ions rather than individual atoms.

Based on the analysis, the only substance that can be classified as an atomic solid is S8 (sulfur).