2. What is the total number of electrons in an atom of an element with an atomic number of 18 and a mass number of 40?
a) 18
b) 22
c) 40
d) 58

3. After bombarding a gold foil sheet with alpha particles, Rutherford concluded that atoms consist mainly of
a) electrons
b) empty space
c) protons
d) neutrons

4. Which element has atoms in the ground state with a sublevel that is only half filled?
a) helium
b) beryllium
c) nitrogen
d) neon

5. Which sublevel contains a total of 5 orbitals?
a) s
b) p
c) d
d) f

6. Electronegativity is a measure of an atom's ability to
a) attract the electrons in the bond between the atom and another atom
b) repel the electrons in the bond between the atom and another atom
c) attract the protons of another atom
d) repel the protons of another atom

7. The elements Li and F combine to form an ionic compound. The electron configurations in this compound are the same as the electron configurations of atoms in which Group?
a) 1
b) 14
c) 17
d) 18

8. As the elements in Group 15 are considered in order of increasing atomic number, which sequence of properties occurs?
a) nonmetal, metalloid, metal
b) metalloid, metal, nonmetal
c) metal, metalloid, nonmetal
d) metal, nonmetal, metalloid

9. In which set do the elements exhibit the most similar chemical properties?
a) N, O, and F
b) Hg, Br, and Rn
c) Li, Na, and K
d) Al, Si, and P

10. Which reactant is most likely to have d electrons involved in a chemical reaction?
a) a halogen
b) a noble gas
c) a transition metal
d) an alkali metal

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