Across
- 1. is a green pigment found in cyanobacteria and the chloroplasts of algae and plants
- 5. is a chemical element with the symbol S and atomic number 16
- 6. is a chemical element with chemical symbol H and atomic number 1
- 7. is a chemical element with symbol He and atomic number 2
- 8. is the indigestible portion of food derived from plants
- 9. is a family of fibrous structural proteins. It is also the key structural component of hair and nails
- 10. is a community of living organisms in conjunction with the nonliving components of their environment, interacting as a system.
- 13. is a chemical element with symbol N and atomic number 7
- 15. in commerce also spelter, is a metallic chemical element; it has the symbol Zn and atomic number 30. It is the first element of group 12 of the periodic table
- 17. is a chemical element with the symbol Na and atomic number 11
- 18. bonding occurs as a result of electromagnetism and describes the electrostatic attractive force that occurs between conduction electrons
Down
- 1. is a naturally-occurring chemical compound composed of 2 oxygen atoms each covalently double bonded to a single carbon atom
- 2. is a chemical element with symbol O and atomic number 8
- 3. is a nonmetallic chemical element with symbol P and atomic number 15
- 4. is a soft and malleable metal, which is regarded as a heavy metal and a post-transition metal
- 11. is the chemical element with symbol Ca and atomic number 20
- 12. is a chemical element with the symbol Mg and atomic number 12
- 13. is a polyatomic ion with the molecular formula NO₃
- 14. is a chemical element with the symbol Ti and atomic number 22
- 16. is a chemical element with symbol Ga and atomic number 31