Question

Name this Molecular/Covalent compound
S2O

(2 is a subscript)

Answer 1

To name covalent compounds, look at the individual atoms:

2 sulfurs
1 oxygen

Covalent names take the form of a numerical prefix and an elemental name postfix. For the first element, use this form:

[prefix][name]

In this case, you have disulfur. Note that you don't use a mono prefix if there's only one of the first atom.

For the second element, use this form:

[prefix][name-ide]

Here, you have monoxide.

The final answer is therefore disulfur monoxide.

Here're a few more examples to help clarify that:\[N _{2}O _{4}\]Dinitrogen tetroxide\[CO\]Carbon monoxide\[SF _{6}\]Sulfur hexafluoride

Answer 2

In addition,
1=mono (often omitted, but sometimes not omitted for distinguishing, e.g. CO=carbon monoxide for distinguishing between it and CO2=carbon dioxide)
2=di
3=tri
4=tetra
5=penta
6=hexa
7=hepta
8=octa
9=nona
10=deca

Answer 3

Yup. Mono- is generally omitted for the first element and used for the second.

Answer 4

agree with above