Name______Class______Date______
Modern Chemistry • CHAPTER 5
HOMEWORK 5-1
1. Explain how Mendeleev developed the periodic table.
2. Explain the term periodicity. How does the term apply to chemistry?
Multiple Choice
_____1. Which statement is true?
a. The modern periodic table was developed at the First International Congress of Chemists.
b. Motion needs to vary uniformly in order to vary periodically.
c. In his periodic table, Mendeleev arranged the elements in order of their atomic numbers.
d. Mendeleev left “gaps” in his periodic table to account for missing elements.
_____2. Which was Stanislao Cannizzaro’s contribution to modern chemistry?
a. He developed a method for measuring the mass of an atom.
b. He created an accurate periodic table.
c. He discovered the elements scandium, gallium, and germanium.
d. He coined the term periodicity to account for chemical properties.
_____3. The noble gases are alike in that they all
a. are exceptions to the periodic law.
b. were included on Mendeleev’s periodic table.
c. are rather unreactive.
d. are radioactive at normal temperatures and pressures.
_____4. The noble gases, the lanthanides, and the actinides were added to the periodic table
a. by Mendeleev.
b. after Mendeleev’s time.
c. by Henry Moseley and Ernest Rutherford.
d. during the First International Congress of Chemists.
_____5. The length of each period on the periodic table is best determined by
a. the research that was done by Ernest Rutherford.
b. the number of electrons that can occupy the sublevels being filled in that period.
c. the atomic masses of the elements in that row.
d. the number of elements in the columns, or groups.
_____6. All of the group 18 elements besides helium are
a. noble gases.
b. p-block elements.
c. d-block elements.
d. both a and b.
_____7. Which statement is true of alkali metals?
a. They are usually stored in water.
b. They are found in nature as free elements.
c. They are unable to combine with nonmetal elements.
d. They are soft enough to cut with a knife.
_____8. Alkaline-earth metals are
a. easier to melt than alkali metals.
b. found in nature as free elements.
c. denser and stronger than alkali metals.
d. radioactive at normal temperatures and pressures.
VOCABULARY
Complete each sentence.
______1. Elements in the same row on the periodic table are said to be in the same ____.
______2. Noble gases are very stable. Therefore, they are usually ____.
______3. As stated by ____, elements with similar properties appear at regular intervals when they are arranged in order of increasing atomic number.
______4. Elements in the same column are said to be in the same ____ or ____.
______
______5. An element’s electron configuration can show you _____.
VOCABULARY
Select the term in Column B that matches the expression in Column A.
Column A / Column B_____ 1. s block / a. period
_____ 2. lithium and sodium / b. hydrogen
_____ 3. radium and barium / c. alkaline-earth metals
_____ 4. 1s1 / d. lanthanide
_____ 5. row / e. alkali metals
_____ 6. thorium / f. reactive metals
_____ 7. cerium / g. actinide
GRAPHIC ORGANIZER
Use the periodic table in your book to fill in the missing information in the chart.
Element / Symbol / Atomic Number / Atomic Mass / ConfigurationCa
73
[Ar]3d6 4s2
Na
1s2
zinc
50
196.97 amu
1
9/30/2012