Download Name - TeacherWeb

Name
Chapter 5
_____________________ Class ______ Date
_______________
The Periodic Table Review KEY
1. Circle the letter of each type of information Mendeleev knew about each element.
a. name
b. number of protons
c. relative mass
d. properties
2. Mendeleev arranged the elements into rows in order of increasing mass so that elements with similar
properties were in the same column.
3. Mendeleev published the table above in 1872. Why did Mendeleev leave some locations in his periodic table
blank? Not all the elements had been discovered at this time.
4. Circle the letters of two elements that have similar properties.
a. zinc (Zn)
b. chlorine (Cl)
c. nitrogen (N)
d. bromine (Br)
5. The close match between Mendeleev’s predictions and the actual properties of new elements showed
the usefulness of this table.
6. True or false? In the modern periodic table, elements are arranged by increasing number of protons. True, by
atomic number (number of protons).
7. Explain why the number of elements per period varies.
The number of protons increases by one across the period but the following must also happen:
number of valence electrons must also be the same going down a column
properties trend across a period and down a column.
The transition metals were placed in the center of the table for this reason.
8. Properties of elements repeat in a predictable way when atomic numbers are used to arrange elements into
groups. This pattern of repeating properties is called the periodic law.
9. Label the four types of information supplied for chlorine in the diagram.
a. atomic number
c. element name
b. chemical symbol
d. atomic mass
10. Circle the letter of each sentence that is true about a carbon-12 atom.
a. It has 6 protons and 6 neutrons.
b. Scientists assigned a mass of 6 atomic mass units to the carbon-12 atom.
c. It is used as a standard for comparing the masses of atoms.
d. An atomic mass unit is defined as one twelfth the mass of a carbon-12 atom.
11. True or false? Most elements exist as a mixture of two or more isotopes. True
12. The mass of an atom of chlorine-37 is less than the mass of an atom of chlorine-35.
13. Name the three categories into which elements are classified based on their general properties.
a. metals
b. metalloids
c. nonmetals
14. True or false? All metals react with oxygen in the same way. False, some react easily and others do not.
15. An important property of transition elements is their ability to form compounds with distinctive colors.
16. Circle the letter of each sentence that is true about nonmetals.
a. Nonmetals are poor conductors of heat and electric current.
b. Many nonmetals are gases at room temperature.
c. Some nonmetals are extremely reactive and others hardly react at all.
d. Nonmetals that are solids tend to be malleable.
17. Across a period from left to right, the elements become less metallic and more nonmetallic in their
properties.
18. Circle the letter of each Period 3 element that is highly reactive.
a. sodium
b. silicon
c. chlorine
d. argon
19. An electron that is in the highest occupied energy level of an atom is a(n) valence electron.
20. Elements within a group have the same number of valence electrons.
21. The reactivity of alkali metals increase from the top of Group 1A to the bottom.
22. Differences in reactivity among alkaline earth metals are shown by the way they react with water.
23. List the four metals in Group 3A.
a. aluminum
b. gallium
c. indium
d. thallium
24. Circle the letter of each sentence that is true about aluminum.
a. It is the most abundant metal in Earth’s crust.
b. It is often found combined with oxygen in bauxite.
c. It is more reactive than sodium and magnesium.
d. It is a good conductor of electric current.
25. List the two metalloids in Group 4A.
a. silicon
b. germanium
26. Except for water, most of the compounds in your body contain carbon.
27. List the nonmetals in Group 5A.
a. nitrogen
b. phosphorus
28. Name two elements in the nitrogen family that are contained in fertilizer.
a. nitrogen
b. phosphorus
29. List the nonmetals in Group 6A.
a. oxygen
b. sulfur
c. selenium
30. Name the most abundant element in Earth’s crust oxygen.
31. List the four nonmetals in Group 7A.
a. fluorine
b. chlorine
c. bromine
d. iodine
32. Halogens have similar chemical properties but different physical properties.
33. Name three characteristics of noble gases.
a. colorless
b. odorless
c. extremely unreactive
34. How can an element that does not react easily with other elements be useful? At extreme heat, an
unreactive atmosphere is necessary for the manufacture of computer chips and other components.