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Chemistry Name____________________________________________Period____Date_____
Practice Test
Unit 2 – The Structure of the Atom
Matching Indicate the scientist associated with the following
((A)Aristotle, (B)Bohr,(C)Chadwick,(D)Dalton, (E)Democritus,(F)Lavoisier, (G)Milikan,
(H)Proust,(I) Rutherford, (J)Thomson)
1. Law of Definite Composition
2. Law of Definite Proportions
3. Experiments with cathode ray tubes
4. Four kinds of matter – fire, earth, water and air
5. Proposed that matter is made of atoms 2000 years ago
6. Discovered the neutron
7. Law of Conservation of Mass
8. Electrons are found in orbits associated with specific amounts of energy
9. Nineteenth century teacher who revived the idea that atoms make up matter
10. Pudding model of the atom
11. Experiments with alpha particles and gold leaf foil showed the atom is mostly empty space
12. Discovered the positively charged proton
13. Oil drop experiment showed the actual mass and charge of the electron
14. Believed that the atom has a large concentration of positive charge surrounded by electrons
15. Pioneer in meteorology who studied the works of Democritus and Proust and proposed his
own atomic theory
Matching – Indicate (P) proton, (N) neutron or (E) electron
16. Mass equals 1 amu
17. Positive charge (+1)
18. Negative charge (-)
19. Mass is 0 amu
Vocabulary Matching (A-molar mass, B-isotopes, C- atomic number D- mass number,
E- average atomic mass F- mole, G – ion, L- isotope, M –hyphen)
20. Atom that gains or loses electrons and acquires a negative or positive charge.
21. Number of protons in the nucleus of an atom
22. Number of protons + number of neutrons in an atom
23. Atoms with the same atomic number but different mass numbers
24. Unit used to measure the mass of one atom
25. Weighted average mass of all known isotopes of an element
26. The number of neutrons can be determined by subtracting the ____from the mass number
27. Atoms of an element with the same number of protons but a different number of nelutrons
28. C-14 (type of isotope notation shown)
29. The 14 in problem # 37 is the ______of an element
30. Nuclear notation includes the symbol for an element, the atomic number and the _______
31. H-1, H-2, H-3 are_____
Problem Solving
32. Write the nuclear notation for an atom that has 56 protons and 82 neutrons.
33. Write the hyphen notation for an isotope that has 8 electrons and 10 neutrons.
34. Given Cu-64, indicate the number of protons________, electrons______ and neutrons._____
35.
26 p+
30 n0
Indicate the atomic number____________ Indicate the mass number __________
(nucleus)
Write the hyphen notation_______________Write the nuclear notation___________
36. Given the following isotopes of an element, determine the average atomic mass.
A-42 (35.5%)
A-41 ( .5%)
A-40 (65.0%)
37. Isotope 1 of Cu (copper) has a mass of 62.940 amu. (69.17% abundance)
Isotope 2 of Cu has an abundance of 30.83%.
The average atomic mass is 63.546 amu.
What is the mass of isotope 2?