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- 1. Fill in the Blank
Based on the gold foil experiment, state two conclusions that were made concerning the structure of an atom.
- 2. Fill in the Blank
In the late 1800s, experiments using cathode ray tubes led to the discovery of which subatomic particle?
- 3. Fill in the Blank
Dalton proposed that "all atoms of the same element must have the same mass." Explain why this assumption is incorrect.
- 4. Fill in the Blank
An atom that contains 55 protons, 45 neutrons, and 55 electrons has an atomic number of...
- 5. Fill in the Blank
In Rutherford's gold foil experiment, most of the alpha particles passed directly through the gold atoms undisturbed. What does this evidence suggest about the structure of the gold atoms?
- 6. Fill in the Blank
The elements on the Periodic Table are arranged in order of increasing...
- 7. Fill in the Blank
What is the total mass of the protons in an atom of U-238?
- 8. Fill in the Blank
Compare the masses of the subatomic particles.
- 9. Fill in the Blank
What is the isotope iodine-131 used for?
- 10. Fill in the Blank
What is the total number of electrons in a neutral atom always equal to?
- 11. Fill in the Blank
What is the formula to find mass number?
- 12. Multiple Choice
An atom of helium-4 differs from an atom of lithium-7 in that the atom of helium-4 has
one more proton
one more neutron
two less protons
two less neutrons
cannot be determined
- 13. Multiple Choice
The most common isotope of chromium (Cr) has a mass number of 52. Which notation represents a different isotope of chromium?
5224Cr
5424Cr
2452Cr
2454Cr
cannot be determined
- 14. Fill in the Blank
What is the total number of neutrons in the nucleus of a K-42 atom?
- 15. Fill in the Blank
Explain, in terms of subatomic particles, why K-37 and K-42 are isotopes of potassium.
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