UNIT 5 TEST KEY

UNIT 5 TEST

1. The first to observe the repeating properties of elements when arranged according to mass was

(A) Moseley (B) Mendeleev (C) Avogadro (D) Bohr

2. What is the total number of valence electrons in an atom of an element in Group 14 in the ground state?

(A) 2 (B) 14 (C) 6 (D) 4

3. What is the total number of electrons found in the outermost energy level of a noble gas in the ground
state?

(A) 8 (B) 7 (C) 2 (D) 1

4. Atoms of nonmetallic elements tend to

(A) lose electrons and form negative ions (B) lose electrons and form positive ions

5. An element has the electron configuration 1s² 2s² 2p⁴. In what group of the Periodic Table is it located?

(A) 8 (B) 4 (C) 14 (D) 16 (E) 2

6. An element has the electron configuration 1s² 2s² 2p⁴. In what period of the Periodic Table is it
located?

(A) 8 (B) 4 (C) 14 (D) 16 (E) 2

7. What is the likeliest oxidation number of an element located in Group 17?

(A) +7 (B) +1 (C) -7 (D) -1 (E) none of these

8. On the Periodic Table, elements in the same group have the same

(A) electronegativity (B) ionization energy

9. On the Periodic Table, elements in the same period have the same

(A) electronegativity (B) ionization energy

10. The most reactive nonmetals are members of Group

(A) 18 (B) 17 (C) 2 (D) 1 (E) 13

11. More than two-thirds of the elements on the Periodic Table are

(A) metals (B) nonmetals (C) metalloids (D) noble gases

12. The number of valence electrons in an atom with an electron configuration of 1s² 2s² 2p⁶ 3s² 3p² is

(A) 3 (B) 14 (C) 4 (D) 2

13. The subatomic particle that plays the greatest role in determining the physical and chemical properties
of an element is the

(A) proton (B) neutron (C) electron (D) ion

14. From top to bottom in a group, electronegativity

(A) decreases (B) increases (C) remains the same (D) varies unpredictably

15. The elements on the modern Periodic Table are arranged in order of increasing

(A) atomic radius (B) atomic number (C) atomic mass (D) oxidation number

16. The most reactive nonmetals on the Periodic Table have

(A) large radii and high electronegativities (B) large radii and low electronegativities

17. Within a group, from top to bottom, ionization energy generally

(A) decreases (B) increases (C) remains the same (D) varies unpredictably

18. The group known for the “octet” of electrons in the outermost energy level is the

(A) noble gases (B) halogens (C) alkaline earth metals (D) alkali metals

19. An element with atomic number “X” is a slightly reactive nonmetal. What property could an element with
the atomic number “X + 1” have?

(A) very reactive nonmetal (B) very reactive metal

20. What is the total number of electrons found in the outermost energy level of an alkali metal in the
ground state?

(A) 8 (B) 7 (C) 2 (D) 1

21. Within a group, from top to bottom, atomic radius

(A) decreases (B) increases (C) remains the same (D) varies unpredictably

22. The scientist who arranged the Periodic Table according to atomic number was

(A) Mendeleev (B) Moseley (C) Avogadro (D) Bohr

23. In Period 3, as the elements are considered from left to right, there is an increase in

(A) ionization energy (B) metallic character

24. A metalloid with strong nonmetallic properties could be followed on the Periodic Table by

(A) a very reactive metal (B) a metalloid with strong metallic properties

25. Which of the following is the electron configuration of a neutral atom in the ground state with a total
of three valence electrons?

(A) 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p¹ (B) 1s² 2s² 2p⁶ 3s² 3p³

C 26. period (A) vertical column of elements

E 27. transition metals (B) Groups 1, 2, & 13 – 18

B 28. main group elements (C) horizontal row of elements

A 29. group (D) two rows at the bottom of the Periodic Table

D 30. rare earth elements (E) Groups 3 – 12

Go back to this test

Back to the Unit 5 Page

Back to the Main Page