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CHEMISTRY ASSIGNMENT #2 NAME:___________________________<br />
1. Fill in the table below.<br />
Protons<br />
Electrons<br />
Neutrons<br />
Charge Location Mass<br />
2. Place the atomic symbol in the brackets following the names in the table below. Fill in<br />
the blanks with the values for the atomic number and number of protons.<br />
Atomic Number<br />
Number of<br />
Protons<br />
Iron( ) Krypton( ) Uranium( ) Sodium( )<br />
3. Use your understanding of mass number to calculate the values for the blank spaces in<br />
the table below. Place the proper symbol for the elements in the brackets.<br />
Number of<br />
Protons<br />
Number of<br />
Neutrons<br />
Mass Number<br />
Lithium( ) Chlorine( ) Copper( ) Silver( )<br />
3 17<br />
4<br />
35 63<br />
47<br />
34 61
CHEMISTRY ASSIGNMENT #2 NAME:___________________________<br />
4. An atom of gold has an atomic number of 79 and an atomic mass of 197u.<br />
a. How many protons are there in one atom of gold?<br />
How many electrons are there in one atom of gold?<br />
How many neutrons are there in one atom of gold?<br />
How many protons are there in 10 atoms of gold?<br />
5. The unit of atomic mass is called an and its symbol is<br />
6. An atom of uranium has an atomic number of 92 and an atomic mass of 238u.<br />
a. How many protons are there in one atom of uranium?<br />
How many electrons are there in one atom of uranium?<br />
How many neutrons are there in one atom of uranium?<br />
How many protons are there in 10 atoms of uranium?<br />
7. Draw the Bohr diagrams for the first 20 elements. (use looseleaf)<br />
8. Arrange the atoms into 8 groups according to the number of electrons in the outer<br />
shell. Give each group a title, for example, one outer shell electron, two outer shell<br />
electrons, and so on...
CHEMISTRY ASSIGNMENT #2 NAME:___________________________<br />
9. Describe the location of the atoms with 1 outer shell electron on the Periodic Table?<br />
10. Describe the location of the atoms with 7 outer shell electrons in the Periodic Table?<br />
11. Describe the location of the atoms with 8 outer shell electrons in the Periodic Table?<br />
12. Why should Helium be in the second column of the Periodic Table?<br />
13. Why do you think that Helium is not shown in the second column of the Periodic<br />
Table?<br />
14. What is the name given to elements found in columns on the periodic table of<br />
elements?<br />
15. What is the name given to elements in rows on the periodic table?<br />
16. Can you find an exception to periodicity in Mendeleev's periodic table? Name the<br />
element that has a decreasing atomic mass to the right of it.<br />
17. How were elements in Mendeleev's periodic table arranged?
CHEMISTRY ASSIGNMENT #2 NAME:___________________________<br />
18. What is Mendeleev's periodic law?<br />
19. Explain why Mendeleev included blanks in his periodic table. How did these blank<br />
spaces strengthen the belief in his method of organizing the elements?<br />
20. Why was Mendeleev able to predict the properties of the elements that belonged in<br />
the blanks in his table?<br />
21. How were elements in Moseley's periodic table arranged?<br />
22. Is our modern periodic table based on atomic mass or atomic number?
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