1. As the first five elements in group 15 are considered in order of increasing atomic number , first ionization energy 1. Decreases
2. Increases
3. Decreases then increases
4. Increases then decreases

2. Based on table S , an atom of which element has the strongest attraction for electrons in a chemical bond ?
1. Aluminum
2.Chlorine
3.Magnesium
4.Sulfur

3. Which element reacts with oxygen to form ionic bonds ?
1.Calcium
2.Hydrogen
3.Chlorine
4.Nitrogen

How does the digestive system interact with the circulatory system? a. messages sent as electrical impulses from the digestive system are transported throughout the body by the circulatory system. b. nutrients taken in and broken down by the digestive system are carried to various parts of the body by the circulatory system. c. nutrients and gases are absorbed by organs in the circulatory system. then, they are transported to all parts of the body by organs in the digestive system. d. oxygen and carbon dioxide are exchanged by organs in the digestive system, and the gases are carried to the rest of the body by the circulatory system.