Practice Questions for Chp 7.1 to 7.4
Multiple Choice
1. This diagram represents:
a. a cation
b. an anion
c. a neutral atom
2. Of the following, which is a molecular element?
a. carbon dioxide c. nitrogen gas
b. table salt
d. ice
3. A potassium ion has
a. 18 protons and 19 electrons
b. 19 protons and 19 electrons
c. 18 protons and 18 electrons
d. 18 protons and 19 electrons
4. If an element has an atomic number of 13 and
an atomic mass of 27, how many neutrons does
it have?
a. 13
b. 14
c. 27
5. The Bohr-Rutherford diagram of oxygen suggests
that in ionic compounds, oxygen would have a
charge of :
a. 0
b. -2
c. +2
d. -1
6. The Bohr-Rutherford diagram shown represents a
a. neutral atom
b. neutral molecule
c. -1 ion
d. +1 ion
7. The diagram shows
8. Which would be a correct name for the compound Li2O?
a. lithium oxygen
c. dilithium oxygen
b. lithium oxide
d. lithide dioxygen
9. In the chemical formula NaHCO3, there are
a. four different elements
b. four non-metallic elements
c. three atoms in total
d. twelve atoms in total
10.
The chemical formula KNO3 indicates there are:
a. 3 potassium, 1 nitrogen and 3 oxygen atoms
b. 1 potassium, 1 nitrogen and 3 oxygen atoms
c. 3 potassium, 3 nitrogen and 3 oxygen atoms
11. Which is the number of sulfur atoms in K2SO4
a. 2
b. 1
c. 4
12. The correct name for CaBr2 is:
a. calcium bromide
b. calcium dibromide
c. monocalcium dibromide
13. The correct chemical formula for
diphosphorus pentaoxide is:
a. PO5
b. P2O5
c. P5O2
14.
Which of the following is a compound?
a. H2
b. NaCl
c. Mg
15.
Which of the following elements has 6 electrons in
its second shell?
*Hint: draw a Bohr-Rutherford diagram.*
a. O
b. F
c. S
16. Which two ions have the same number of electrons?
a. sodium and potassium
b. fluorine and chlorine
c. sodium and fluorine
d. none of the above
17. Of the following, which represents the most stable
element?
a. how sodium and chlorine form a covalent bond
b. how sodium and chlorine become new elements
by exchanging an electron
c. how sodium and chlorine form an ionic bond
a. Diagram 1
b. Diagram 2
c. Diagram 3
d. Diagram 4
18.
Complete the following table:
Chemical
formula
Composition
Type of compound
SO3
1 sulfur atom
3 oxygen atoms
 Molecular compound
Both non-metals
Name
Sulfur trioxide
CaCl2
MgO
CF4
Li2O
Na2S
BeF2
N2O
CaO
P4O10
Na3N
Dinitrogen tetraoxide
Al2O3
Mg3P2
Iodine heptafluoride
KI
Dihydrogen monosulfide
MgCl2
Carbon monoxide
Sulfur dioxide
Phosphorus pentafluoride
19. In forming ionic compounds, metals tend to ________ electrons; while non-metals tend to ________ electrons.
20. When magnesium reacts with fluorine to form an ionic compound, what is the expected chemical formula for the
compound? Explain how you got your answer.