Download Ch 2 Test

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Ch 2 Review - Part 1
Indicate the answer choice that best completes the statement or answers the question.
1. Which of the following statements about the atom is false?
a. Each atom has a tiny nucleus at its center.
b. All the protons and neutrons are located in the nucleus.
c. Electrons travel in definite circular pathways around the nucleus.
d. All atomic nuclei are positively charged.
2. In _____, the atomic number decreases by two.
a. alpha decay
b. beta decay
c. gamma decay
d. omega decay
3. Which of the following statements best describes how the Bohr model of an atom is different from Rutherford's?
a. Bohr’s model had more electrons around the nucleus.
b. Bohr’s model shows electrons at certain distances from the nucleus.
c. Bohr’s model placed the electrons in the nucleus.
d. Bohr’s model did not distinguish positive and negative charges.
4. Based on his experiment, Rutherford concluded that atoms were ____.
a. dense positively charged particles
b. uniform throughout
c. mainly empty space
d. made of protons, neutrons, and electrons
5. A certain atom has 26 protons, 26 electrons, and 30 neutrons. It mass number is ____.
a. 26
b. 30
c. 52
d. 56
6. The particles that make up an atom are ____.
a. electrons, protons, and nuclei
b. elements, protons, and electrons
c. protons, neutrons, and nuclei
d. protons, neutrons, and electrons
7. A single proton has which electrical charge?
a. no charge
b. positive charge
c. negative charge
d. either a positive or a negative charge
8. Which two particles would be attracted to each other?
a. electrons and neutrons
b. electrons and protons
c. protons and neutrons
d. All particles are attracted to each other.
9. The energy levels of an atom are occupied by ____.
a. electrons
b. protons
c. neutrons
d. ions
10. _____ does not change an element into another element.
a. Alpha decay
b. Beta decay
c. Gamma decay
d. Omega decay
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Name:
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Date:
Ch 2 Review - Part 1
11. Which of the following used the Gold Foil experiment and discovered the nucleus and protons?
a. Dalton
b. Planck
c. Rutherford
d. Thomson
12. In _____, the atomic number increases by one.
a. alpha decay
b. beta decay
c. gamma decay
d. omega decay
13. If two atoms have the same number of protons but different numbers of neutrons, they will have the same ____.
a. half-life
b. mass number
c. atomic number
d. degree of stability
14. In an atom, electrons ____.
a. are located in the nucleus
b. are paired with neutrons
c. travel outside the nucleus
d. are always in the same place in an atom
15. When Rutherford performed his gold foil experiment, he was surprised that some of the alpha particles ____.
a. were deflected by the foil
b. bounced back from the foil
c. were absorbed by the foil
d. passed straight through the foil
16. Which particles have almost the same mass?
a. proton and electron
b. proton and neutron
c. electron and neutron
d. all three particles
17. Which item best represents Dalton’s mental image of an atom?
a. a cork
b. a candy bar with nuts
c. a marble
d. a balloon full of air
18. Which of the following found that atoms have a nucleus?
a. Aristotle
b. Dalton
c. Rutherford
d. Thomson
19. What was on the photographic plate in Becquerel’s drawer with the uranium?
a. an image of the mineral
b. a sun spot
c. Becquerel’s fingerprints
d. Nothing. It was clean.
20. The nucleus of an atom consists of _____.
a. electrons
b. neutrons
c. protons and neutrons
d. protons, neutrons, and electrons
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Name:
Class:
Date:
Ch 2 Review - Part 1
21. Which scientist proposed this model for atoms?
a. Dalton
c. Rutherford
b. Democritus
d. Thomson
22. Which item best represents Thomson’s mental image of an atom?
a. a sponge
b. a chocolate-chip cookie
c. a bowling ball
d. a beach ball
23. Who proposed this model of atoms?
a. Dalton
c. Rutherford
b. Democritus
d. Thomson
24. Which of the following determined that cathode rays are negatively charged and are made of electrons?
a. Aristotle
b. Dalton
c. Rutherford
d. Thomson
25. A certain atom has 11 protons, 11 electrons, and 12 neutrons. It mass number is ____.
a. 11
b. 22
c. 23
d. 34
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