Questions

1. According to the Periodic Table, which elements are considered to be metalloids? What properties of metalloids distinguish them from metals and non-metals?

2. What trends do you notice in electronegativity as you go across a period? What about down a group?

3. Identify the bond type for each of the following as either non-polar covalent, polar covalent, or ionic.

   a. HF

   b. F

   c. CaCl₂

   d. CaS

4. How does the valence structure of oxygen predict that the formula of water is H₂O?

5. Sketch the distribution of sodium and potassium ions in a muscle cell before and during depolarization.

6. Sketch a taste receptor cell. Indicate and explain what events occur when an umami factor is tasted.

7. Sketch the alpha decay of ²³⁸U.

8. How is barium used in medical diagnostics?

9. How did Suzanne Simard prove that the trees in a forest are somehow linked?

10. Fill in the following chart.
    
    

    Symbol	Ca		P
    Ion Charge	+2		-3
    Number of protons		19
    Number of electrons		18		36
    Number of neutrons	21		16	45
    Atomic number				34
    Mass number		40

Developed for SWBIC by John Palmer, Gadsden High School.