Chapter 1 review questions
1. What are the three subatomic particles? Where are their locations?
2. What is an element?
3. What are compounds and what are they composed of?
4. What is a mixture? How is it different from a compound?
5. How many electrons can each energy level hold?
6. What is special about noble/inert gases?
7. Why do atoms form ions?
8. What is electronegativity? Give an example of two atoms that would be attracted to each other.
9. List five properties of metals and list four properties of non-metals.
10. What is special about hydrogen and helium?
11. Write the electron shell configuration for the following elements:
a) an atom of phosphorus (atomic number 15)
b) an atom of potassium (atomic number 19)
c) an atom with atomic number 7
d) an atom in Period 3, Group VII
12. Which elements out of the following are expected to conduct electricity?
13. What is the period number of an element the same as?
14. What is the group number of an element the same as?
15. Does a metal or a non-metal have higher electronegativity?
16. Balance the following chemical equations
a) NH3 N2 + H2
b) PCl5 PCl3 + Cl2
c) C + H20 CH4 + CO2
d) SO2 + H2 S + H20
e) N2 + H20 NH3 + O2
17. Why can’t a chemical equation be left unbalanced?
18. How many protons, electrons and neutrons do the following elements have?
19. Ca2040 Au79197 Cl1735 Na 1123
20. How many protons, electrons and neutrons do the following elements have?
Zn 2+ (atomic number 30, mass number 65)
Mg 2+ (atomic number 12, mass number 24)
21. When does a compound form? Name some examples of common compounds.
22. What are native metals?
23. What are metalloids?
24. Complete the following table:
Atom | Atomic number | Mass number | Number of protons | Number of electrons | Number of neutrons | Symbol for atom |