PLEASE DO NOT WRITE ON THIS!
PLACE YOUR ANSWERS ON A SEPARATE SHEET OF PAPER!
1. How many protons are in lithium?
a. 1
b. 2
c. 3
d. 4
e. 7
2. How many neutrons are in Be?
a. 2
b. 4
c. 5
d. 9
3. How many electrons are in a neutral fluorine atom?
a. 9
b. 7
c. 17 d. 10 e. 19
4. Neon and nitrogen are in the same family
a. true
b.false
5. sodium is chemically similar to
a. lithium
b. magnesium
6. How many energy levels does chlorine have?
a. zero
b. one
c. two
d.three
e. four
f. five
7. Atomic number is the _____ number and it tells how many______
a. bottom, protons + neutrons
b. bottom, protons
c. top, protons + neutrons
d. top, protons
8. An isotope is an atom with the same number of _____ but a different number of ______.
a. neutrons, protons
b. protons, neutrons
c. protons, electrons
d. electrons, protons
9. Nuclear reactions involve changes in an atom’s ____ while chemical reactions involve changes with )).
a. nucleus, electrons
b. electrons, nucleus
10. The reason why atoms undergo radioactive decay is to become unstable
a. true
b.false
11. Calcium is in the ____ family
a. halogen
b. metalloids
c. alkaline earth metals
12. Neon is in the _____ family
a. halogen
b. metalloids
c. alkaline earth metals
d. alkali metals
e. transition metals
d. alkali metals
e. transition metals
f. noble gas
PLEASE DO NOT WRITE ON THIS!
PLACE YOUR ANSWERS ON A SEPARATE SHEET OF PAPER!
13. What subatomic particle identifies the element?
a. proton
b. neutron
c. electron
14. Which of the following statements is true
a. protons, neutrons, electrons are all the same size
b. neutrons and electrons are the same size
c. neutrons and protons are the same size
d. protons and electrons are the same size
e. protons, neutrons, electrons are all different sizes
15. Which would have the lowest effect on the average atomic mass?
Cesium-133 75%
Cesium-132 25%
a. Cesium-133
b. Cesium-132
16. Classify the mixture: sweet tea
a. heterogeneous
b. homogeneous
17. Classify the mixture: bag of Halloween candy
a. heterogeneous
b. homogeneous
18. What is the net charge of an atom’s nucleus?
a. negative
b. neutral
c. positive
d. depends on the element
19. What two particles are found within the nucleus?
a. neutrons and electrons
b. neutrons and protons
c. protons and electrons
d. nucleus and protons
e. only protons
f. only neutrons
20. The half life of francium is 22 minutes. How long would it take for a sample to decompose to 1/16 its
original amount?
21. Lithium composes 53 grams of a 150 gram sample of LiBr. Calculate the percent by mass of lithium.
22. If magnesium composes 40% of a 300 gram sample of MgCl2, how many grams of magnesium is
present?
SEE BELOW FOR ANSWERS!
Answers:
1. c. 3 (atomic number= top number)
2. c. 5 (atomic mass – atomic number = 9-4 =5)
3. a. 9 (same as protons = atomic number = top)
4. b. false (families go up and down)
5. a. lithium (families go up and down)
6. d. three (energy levels are periods which go side to side)
7. d. top, proton
8. protons, neutrons
9. a. nucleus, electrons
10. b. false (to become stable)
11. c. alkaline earth metals
12. f. noble gases
13. a. protons
14. c. neutrons and protons are the same size (electrons are much smaller)
15. b. Cesium-132 (least effect means look for lowest percentage)
16. b. homogeneous (looks the same through out)
17. a. heterogeneous (looks different through out)
18. c. positive (nucleus contains protons (positive) and neutrons (neutral charge))
19. b. neutrons and protons
20. 1  ½  ¼  1/8  1/16 4 half lives x 22 minutes each = 88 minutes
21. element / compound x 100 = %
53/150 x 100 = 35.33 %
22. element / compound x 100 = %
x / 300 x 100 = 40 x = 120 g