I think O and Cl will form covalent bonds since they are both non-metals and don't have a large enough difference in electronegativities to create an ionic bond.
I hope this helps. Let me know if anything is unclear.
Atom= the basic unit of a chemical element
Answer:
There are different explanations but the main one is the number of electrons the element has.
Explanation:
The elements are also divided into nonmetals, metals, and metalloids. There are general areas for example, most metals are in the middle and left side of the periodic table, nonmetals are typically on the right, and metalloids are inbetween them.