College Prep Chemistry
Chapter 3 Review
Name________________________________
A. Completion. Write the correct word(s) to complete each statement below.
1. All matter is composed of discrete, indestructible_________________.
2. Thomson model of the atom is known as the __________ __________ model.
3. Rutherford used ____________ ______________ to bombard gold foil in his famous
experiment.
4. The three major subatomic particles are_________, _________,
and_______________.
5. The atomic number is the number of ______________in an atom.
6. The small dense center of the atom is called the ______________, and it contains the
____________and _______________.
7. ____________are atoms with the same atomic number but different mass numbers.
8. An atom of 13C contains ___________protons, ______electrons, and _____neutrons.
9. To determine the number of neutrons in an atom, the ___________number is
subtracted from the _______________number.
10. The ____________ __________ of an element is the weighted average of all of the
isotopes of that element.
11. The vertical columns in the periodic table are called___________, and the horizontal
rows are called____________.
12. The elements in group IIA of the periodic table are known as the_________
________metals.
13. The atomic radii of the elements _____________going from left to right and
_____________going from top to bottom in the periodic table.
14. The name of the element with the symbol K is ____________.
15. The ________________ _____________is the minimum energy required to remove
the outermost electron from a neutral atom.
16. An atom that has lost 3 electrons has a charge of ____________.
17. Positively charged ions are called______________, and negatively charged ions are
called ____________.
B. True-False. Indicate whether each statement below is true or false, and explain why the
false statements are false.
_________1. All the atoms of a particular element are exactly alike.
_________2. All the atoms of carbon contain 6 protons.
_________3. The atomic mass of an element is the sum of its protons and neutrons.
_________4. All of the atoms of nitrogen contain 7 neutrons.
_________5. Isotopes are atoms that have the same number of protons but different
numbers of electrons.
_________6. In the modern periodic table, the elements are arranged according to
increasing atomic mass.
_________7. Anions are ions that contain more protons than electrons.
C. Questions and problems
1. Explain why Dalton’s statement that “ all atoms of a particular element are exactly
alike” is false.
2. Write the symbols for the following elements:
a. helium b. potassium
c. sodium d. iron e. silver
f. gold
3. Indicate the number of protons, neutrons, and electrons in an atom of each of the
following isotopes:
a. 200At
b. 108Ag
c. 15N
d. 23Na
4. Write the full atomic symbol and the abbreviated symbol for each of the following:
a) A carbon atom that contains 8 electrons
b) A hydrogen atom with a mass number of 3
5. Identify each of the subatomic particles described below:
a. -1 charge, mass= 1/1867
b. 0 charge, mass=1
c. +1 charge mass =1
6. Calculate the atomic mass of bromine. Br is composed of two isotopes, 79Br 50.5 %
abundant and mass 78.9amu and 81Br 49.5% abundant with a mass of 80.92amu.
7. Arrange the following elements in order of increasing atomic radius ( from smallest
to largest) Explain your order. N, As, O, F, and P
8. Arrange the elements in problem 7 in order of decreasing ionization energy.