1 How many electrons are in the outermost principal energy level of an atom of carbon in the ground state?

(1) 6       (3) 3
(2) 2      (4) 4

1         2         3         4        

2 In which group do the particles contain only nucleons?

(1) protons and electrons
(2) neutrons and electrons
(3) protons and neutrons
(4) protons, neutrons, and electrons

1         2         3         4        

3 Given the electron dot diagram:


The electrons in the bond between hydrogen and flourine are more strongly attracted to the atom of

(1) hydrogen, which has the higher electronegativity
(2) fluorine, which has the higher electronegativity
(3) hydrogen, which has the lower electronegativity
(4) fluorine, which has the lower electronegativity

1         2         3         4        

4 In which system do molecule-ion attractions exist?

(1) KCl(s)        (3) KCl(ℓ)
(2) KCl(aq)       (4) KCl(g)

1         2         3         4        

5 In which compound do atoms form bonds by sharing electrons?

(1) H2O         (3) CaO
(2) Na2O      (4) MgO

1         2         3         4