McLellan’s Honors Chemistry
Review for Chapter 2 Exam
1. List three major subatomic particles, charges, relative masses, locations
2. Know significance of atomic number (Z)
3. Know how to find number of neutrons from mass number and atomic number.
4. Explain difference between an atom’s mass number (A) and atomic weight (amu)
5. Describe relationship between isotopes, percent abundance, and atomic
Find atomic weight for magnesium with its 3 isotopes:
Mg-24, mass = 23.985045, 78.80%
Mg-25, mass = 24.985840, 10.15%
Mg-26, mass = 25.982591, 11.15%
6. Read and write notation for isotopes
a. An atom with 43 protons and 50 neutrons
b. An atom with a mass number of 160 and 87 neutrons
c. An atom with 87 protons and a mass number of 160
7. Read The Periodic Table, describe periodicity, identify periods, groups/families,
metals, nonmetals, metalloids, alkali metals, alkaline earth metals, transition metals,
halogens, noble gases
8. Be familiar with the distribution of elements on Earth and in living systems (reading)
9. Know the 7 elements that form diatomic molecules in nature.
10. Know what these terms mean: chemical formula, molecule, molecular formula,
structural formula, allotrope, ion, ionic compound, empirical formula, polyatomic ion
11. Be able to name and write formulas for ionic compounds
12. Be able to name and write formulas for binary molecular compounds
13. Be able to name and write formulas for hydrated compounds
14. Recognize the names of some common acids, bases, and organic compounds
(reading)