How to figure out the ratios in which elements combine

[ryan001]

Homework Statement

I need to know is how to figure out the ratio's in which the elements in period 2 combine with
chlorine and oxygen i.e a method to solve the problem.
I 'm currently in 10th grade.

Thanks in advance I appreciate the help.

Homework Equations

None that I know of

The Attempt at a Solution

I have no idea where to start. I have tried adding and subtracting electrons, but that does not add up to the answers at the back of my textbook

 

[epenguin]

I can't read your attachment but...

Are you familiar with the concept 'valency'?

Then, but I'd say in second place, there is some theory for it in terms of electrons.

 

[Teemo]

Most elements will combine such that there is no net charge. Like epenguin said, learn about valency and determine whether the elements that combine with oxygen bond covalently or ionically. This will allow you to determine the ratio required for any two elements to share/(donate/receive) electrons to form a compound with neutral charge.