Chemistry Gonzalo B

4. What type of bonds form between oppositely charged ions?
7. The __________ model describes electrons in specific energy levels around the nucleus.
8. elements Elements that are required in smaller quantities compared to bulk elements are known as __________.
12. The sharing of electrons between atoms forms __________ bonds.
14. What term describes the attraction an atom has for electrons in a chemical bond?
17. What are the outermost electrons of an atom called?
19. Lack of __________ can lead to anemia and reduced oxygen transport.
20. __________ are a unit of energy used to quantify the energy content of food.
22. The variable that is measured or observed in an experiment is called the __________.
23. What is the group in an experiment that is not exposed to the independent variable?
24. Metallic elements form __________ bonds.

1. What is the term for the natural 24-hour internal clock that regulates biological processes?
2. The arrangement of atoms and their valence electrons in a molecule is shown by a __________.
3. What are the factors in an experiment that are kept constant?
5. The variable manipulated or changed by the researcher is known as the __________.
6. The lowest energy state of an atom is called the __________ state.
9. Problems associated with toxic metals are referred to as __________.
10. When an atom absorbs energy, it moves to an __________ state.
11. __________ electrons are involved in the formation of chemical bonds.
13. Foods that provide calories but offer little nutritional value are called __________.
15. Which group in an experiment is exposed to the independent variable?
16. Excess __________ can cause copper toxicity and organ damage.
18. What are the major elements required in large quantities by living organisms?
21. What are the minimum nutrient intake levels necessary to maintain health?