1. Bilal is studying Rutherford's atomic model. He learns that Rutherford conducted the gold foil experiment. Based on Rutherford's model, what did he conclude about the atom?
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Chapter 3: Atomic Structure
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2. Fatima is reviewing atomic structure and subatomic particles. She knows that electrons are found outside the nucleus. What is the approximate mass of an electron compared to a proton?
3. Rania is studying carbon dating. She learns that carbon-14 has a half-life of about 5730 years. What does half-life mean?
4. Rania is studying relative atomic mass. She learns that it is the weighted average mass of an atom compared to 1/12th of carbon-12. What unit is used for relative atomic mass?
5. Which of the following is an isotope of hydrogen?
6. Usman is learning about the shell structure of atoms. He knows that the third shell (n=3) has three sub-shells: s, p, and d. What is the maximum number of electrons that can be held in the third shell?
7. Ibrahim is studying the behavior of electrons in an electric field. He learns that electrons are deflected towards the positive plate. What does this indicate about the electron?
8. Vera is studying shells and sub-shells. She learns that the second shell (n=2) has two sub-shells: s and p. How many electrons can the p sub-shell hold?
9. Yara is learning about radioactivity. She understands that radioactive isotopes have unstable nuclei. What type of radiation is commonly emitted by radioisotopes?
10. Waleed is learning about symbols for atoms and ions. He knows that the symbol for a sodium ion is Na+. What does the '+' sign indicate?