Since covalent bond is formed by sharing of electrons these can not form a covalent bond;
- Ca and CI
- Co and o
- Ba and N
What is a covalent bond?
A covalent bond is formed between atoms by the sharing of electrons. Two atoms come together and share electrons between two nuclei.
The following elements can not form a covalent bond with each other;
- Ca and CI
- Co and o
- Ba and N
Learn more about covalent bond: https://brainly.com/question/10373907
