Unit 3 Test
Multiple Choice
Please select the correct response for the following questions.
1. What is the smallest part of all matter called? (1 point) *
a. Element
b. Atom
c. Molecule
d. Compound
2. Which of the subatomic particles is negative? (1 point)
a. Nucleus
b. Neutron
c. Proton
d. Electron
3. Who provided the first evidence that atoms contain subatomic particles? (2 points) *
a. Thomson
b. Rutherford
c. Dalton
d. Newton
4. When two fluorine atoms share a pair of electrons, the bond that forms is a(n) _____________. (2 points) *
a. Double bond
b. Polar covalent bond
c. Nonpolar covalent bond
d. Ionic bond
5. How would you find the number of neutrons in an atom? (2 points) *
a. Atomic number - mass number
b. Mass number - atomic number
c. Electrons + protons
d. Protons - electrons
6. Isotopes of an element have the same atomic number, but different mass numbers because they have different numbers of ________________. (2 points) *
a. Electrons
b. Protons
c. Neutrons
d. Subatomic particles
7. Electrons in the first energy level of an atom, (2 points) *
a. Have no energy
b. Have the lowest possible energy
c. Have the highest possible energy
d. Are unstable
8. An element that is shiny and easily conducts electric currents is called a ________________. (2 points) *
a. Nonmetal
b. Metal
c. Transition metal
d. Noble gas
9. Elements that have the same number of valence electrons are in the same __________ on the periodic table. (2 points) *
a. Group
b. Period
c. Row
d. Section
10. Which list of elements contains only metalloids? (2 points) *
a. Gallium, germanium, and arsenic
b. Silicon and germanium
c. Aluminum, silicon, and phosphorus
d. Phosphorus and arsenic
11. In the Rutherford experiment, why weren’t all the alpha particles deflected? (3 points) *
a. The particles have a positive charge.
b. The particles were too small.
c. The nucleus was too small compared to the atom as a whole.
d. The beam was attracted to a positively charged plate.
12. What does an electron cloud represent? (3 points)
a. The location of electrons around the nucleus
b. The location of electrons within the nucleus
c. The location of electrons in the universe
d. The location of the nucleus
Using the periodic table, find the element (1 point each)
13. What element is in period 2 group 5A (15)? *
Your answer
14. What element is in period 4 group 2A (2)? *
Your answer
15. What element is in period 6 group 1B (11)? *
Your answer
Name the following compounds (1 point each):
16. KCl *
Your answer
17. NO *
Your answer
18. H2O *
Your answer
19. Mg(OH)2 *
Your answer
Open Ended
Please answer the following question in complete sentences.
20. Why isn’t it possible for an atom to have a mass number of 15 and an atomic number of 18? (4 points) *
1 answer
5 answers