Unit Four

The Periodic Table

Choose the best answer to each of the following questions.

1. John Newlands arranged the elements in order of their increasing atomic mass and noted a repetition of similar properties with every eighth element. To explain this observation he proposed the
   a. periodic law.
   b. arrow diagram.
   c. law of octaves.
   d. triads.

 2. The modern periodic law states that the properties of the elements are
    a periodic function of their _________
     a. atomic radius
     b. atomic number
     c. atomic mass
     d. atomic charge

7. Which of the following is the correct electron configuration on an
    element that is in period 4, group 2?
    a. 1s²2s²2p⁶3s²3p⁶4s²
    b. 1s²2s²2p⁶3s²3p⁶4s¹
    c. 1s²2s²2p⁶3s²3p⁶4s²3d²
    d. 1s²2s²2p⁶3s²3p⁴4s²

8. Elements with three or fewer valance electrons are considered to be
    _________
    a. nonmetals
    b. metals
    c. metalloids
    d. halogens

9. A substance that conducts heat well, is hard and is malleable is best
    classified as a ______
    a. nonmetal
    b. halogen
    c. metalloid
    d. metal

10. Which of the following is an example of a metalloid?
      a. I
      b. In
      c. Br
      d. B

11. The period number in the periodic table designates the _______
      a. principal quantum number for outer electrons
      b. total nuclear charge
      c. maximum number of valance electrons
      d. minimum number of valance electrons.

12. In what region of the periodic chart are electrons being added to the
      d-sublevel as atomic number increases?
      a. alkali metals
      b. transition elements
      c. alkaline earth metals
      d. noble gases

13. Arsenic is in group 15, period 4. What is the valance electron
     configuration of arsenic?
     a. 5s²5p²
     b. 4s²3p⁵
     c. 3d⁵
     d. 4s²4p³

14. Element X has a valance electron configuration of 5s²4d¹⁰5p⁶. Which
     of the following describes this element?
     a. unstable metal
     b. unstable nonmetal
     c. stable metal
     d. stable nonmetal

15. As the atomic number in a period increases, the degree of nonmetallic
     character of the elements ________
     a. remains the same
     b. increases then decreases
     c.increases
     d. decreases

16. Which of the following is the most important factor in determining the
      properties of an element?
      a. atomic mass
      b. position on the periodic chart
      c. valance electron configuration
      d. atomic radius

17. As the principal quantum number increases, the size of the electron
      cloud _________
      a. varies at random
      b. increases
      c. remains constant
      d. decreases

18. What is the likeliest oxidation number of an element located in period
      3 and group 16?
      a. –2
      b. +3
      c. +2
      d. –3

19. As you move through a period, from metals to nonmetals, the first
     ionization energy ________
     a. decreases
     b. varies at random
     c. remains constant
     d. increases

20. Which of the following occurs when an element in group 2 attains a
      stable electron configuration?
      a. it gains 8 electrons                    c. it gains 2 electrons
      b. it loses 2 electrons                    d. it gains 6 electrons

1. Given the following valance configurations for unknown elements A –G, respond to each of the following questions:

A = 2s²2p⁴ C = 4s¹ E = 6s²4f¹⁴5d⁹ G = 2s¹

B = 4s²3d¹⁰4p⁵ D = 3s²3p⁶ F = 6s²

1. Identify each of these elements.

1. Which, if any, of these elements belong to the same period?

 

2. Which, if any, of these elements belong to the same group?

 

3. Which, if any, of these elements are metals?

 

4. Which, if any, of these elements are nonmetals?

 

5. Which, if any, of these elements are stable?

1. Complete the chart.

Complete the charts.