1 What is the electron configuration of a sulfur atom in the ground state?

(1) 24       (3) 284
(2) 26       (4) 286

1         2         3         4        

2 The modern model of the atom shows that electrons are

(1) orbiting the nucleus in fixed paths
(2) found in regions called orbitals
(3) combined with neutrons in the nucleus
(4) located in a solid sphere covering the nucleus

1         2         3         4        

3 Which compound contains ionic bonds?

(1) NO       (3) CaO
(2) NO2      (4) CO2

1         2         3         4        

4 All the isotopes of a given atom have

(1) the same mass number and the same atomic number
(2) the same mass number but different atomic numbers
(3) different mass numbers but the same atomic number
(4) different mass numbers and different atomic numbers

1         2         3         4        

5 What are two properties of most nonmetals?

(1) high ionization energy and poor electrical conductivity
(2) high ionization energy and good electrical conductivity
(3) low ionization energy and poor electrical conductivity
(4) low ionization energy and good electrical conductivity

1         2         3         4