Living in the Environment 18th Edition by Tyler Miller,Scott Spoolman

Exercise 2

What are the two key concepts for this section What is matter Distinguish between an element and a compound and give an example of each. Define atoms , molecules , and ions and give an example of each. What is the atomic theory Distinguish among protons (p) , neutrons (n) , and electrons (e). What is the nucleus of an atom Distinguish between the atomic number and the mass number of an element. What is an isotope What is acidity What is pH