Across
- 5. The action of speaking or acting on the behalf of someone or the state of being so represented.
- 6. The mass of an atom of an atomic element in AMU
Down
- 1. A number of people or things that are located close together or are considered or classed together.
- 2. A table of chemical elements arranged in order of atomic number…
- 3. A period is a row of chemical elements, all with the same number of electrons.
- 4. Chemical symbols are abbreviations used in chemistry, mainly for chemical elements.