Across
- 3. what is the compound of two hydrogen and one oxygen?
- 5. is an electron that is associated with an atom.
- 10. what is famous of C?
Down
- 1. element is a species of chemical objects, chararacterized by a number of protons in atoms nucleus.
- 2. are the elements in groups 14-16 of the periodic table.
- 4. are the elements found along the step like line between metals and non-metals of the periodic table.
- 6. is the number of protons in an atom of an element.
- 7. this naturally occuring chemical compound is composed of a carbon atom covalently double bonded to two oxygen atoms.
- 8. what is famous in N2?
- 9. have a positive electric charge.