Periodic Table and Exam Review Answer

Module 3 Exam Review ANSWER KEY
Multiple Choice
1. Which of the following did Mosley believe?(3.01)
a. The elements should be arranged based upon current knowledge of electrons.
b. The elements should be arranged based upon the number of neutrons.
c. The periodic table should be organized based upon atomic number.
d. The periodic table should be organized based upon chemical properties.

2. What is significant about elements in the same group on the periodic table? (3.02)
a. They have the same number of protons.
b. They have the same number of electrons.
c. They have the similar chemical properties.
d. They are all noble gases.

3. As you go left to right across the periodic table, which of the following is true? (3.02)
a. The elements have the same number of valence electrons.
b. The elements increase in radius.
c. The elements have the same common charge.
d. The elements increase the number of protons.

4. Chlorine (Cl), Oxygen (O), Xenon (Xe) and Bromine (Br) are all nonmetals. Using the periodic table, which pair of elements has the most similar properties? (3.02)
a. Chlorine and oxygen
b. Oxygen and xenon
c. Xenon and hydrogen
d. Bromine and chlorine

5. Using the periodic table, which of the following elements has the LEAST properties in common with Oxygen (O)? (3.02)
a. Selenium
b. Iodine
c. Polonium
d. Sulfur

6. Which of the following pairs of elements could possibly be in the same group? (3.02)
a. X has a 3+ ion; Y has a 3- ion.
b. X tends to form a 1+ ion; Y has one valence electron.
c. X will tend to gain two electrons; Y has two valence electrons.
d. X has an atomic number 49; Y forms a 2+ ion.