Atomic Structure Review Name: ______
Atomic History Questions: Know all scientists, their experiments, and the outcomes of the experiments…
1. The ______experiment led to the discovery of the electron. ______was the scientist involved with this experiment.
2. Millikan’s ______experiment found the ______of an electron.
3. ______proposed a model of an atom referred to as the “Plum Pudding” model.
4. Rutherford’s experiment was the ______experiment. It proved the existence of a central, positively charged region called the ______and proved that most of an atom is ______.
5. The ______model of the atom is based on a planetary design.
6. What were the main points of Dalton’s atomic theory?
7. What were the 2 points that have since been revised?
8. Why are atoms considered to be neutral?
9. List the 3 subatomic particles and state their charges:
10. Which of the subatomic particles is the smallest?
11. Which two particles are about equal in size?
12. Name 3 characteristics of the nucleus?
13. What is most of an atom’s mass due to?
14. What accounts for the size (volume) of an atom?
15. Isotopes vary in the number of ______they have.
16. Isotopes also vary in their atomic ______.
17. Write the hyphen notation of the three isotopes of hydrogen:
18. The most common form of hydrogen is hydrogen - ______which is also called ______.
19. What subatomic particle can always be predicted, using the periodic table?
20. What number do you look at on the periodic table, to determine the number of protons?
21. Protons + Neutrons = ______
22. Mass Number – Protons = ______
23. Complete the Table. Use your periodic table to help.
Isotope / Mass Number / Protons / Neutrons / Electrons1H+1
1
H-2
Carbon-13
C-14
16O
8
18O-2
8
Cesium-133
63Cu
29
U-234
U-238
24. A student looked up the naturally occurring isotopes of bromine and found the following information:
50.54% of the naturally occurring isotopes of bromine have an atomic mass of 78.92 amu, while 49.46% of the naturally occurring isotopes of bromine have an atomic mass of 80.92 amu. Calculate the average atomic mass of bromine:
25. Using the following data, calculate the average atomic mass of magnesium (give your answer to the nearest hundredths place):
Isotope: Mg-24 Percent abundance: 78.70%
Isotope: Mg-25 Percent abundance: 11.17%
Isotope: Mg-26 Percent abundance: 10.13%
Mole Problems =
26. Find the number of atoms of phosphorus in 2.44 moles of phosphorus:
27. What is the mass of 1.38 moles of cobalt?
28. How many moles of nickel is 4.88 x 1025 atoms of nickel?
29. How many atoms are in 850. g of selenium?
30. If a particular compound is composed of elements A and B, the ratio of the mass of B to the mass
of A will always be the same. This is a statement of the law of ______.
31. If two or more compounds are composed of elements A and B, the ratio of the masses of B combined
with 1 g of A is a ratio of small whole numbers. This is a statement
of the law of ______.