History of the Periodic Table and Atomic Structure Study

1. What is the definition of matter?

• Anything that has mass and takes up space
• Anything that can be seen
• Anything that is made of atoms
• Anything that can be touched

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2. What did Democritus contribute to the understanding of matter?

• He discovered the electron
• He named the atom
• He created the periodic table
• He proposed the atomic theory

3. What is the main idea of John Dalton's Solid Sphere model?

• Atoms cannot get any smaller
• Atoms are made of smaller particles
• Atoms can change their mass
• Atoms are always in motion

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4. Which experiment led to the downfall of JJ Thomson's model?

• Gold Foil Experiment
• Oil Drop Experiment
• Double-slit Experiment
• Photoelectric Effect

5. How did Henry Moseley contribute to the periodic table?

• He arranged it by atomic mass
• He discovered the neutron
• He arranged it by atomic number
• He created the first model of the atom

6. What does the Bohr model of the atom propose?

• Electrons are in fixed orbits around the nucleus
• Electrons are randomly distributed
• Atoms are solid spheres
• The nucleus is made of electrons

7. What does Schrodinger's model describe about electrons?

• Exact path of an electron
• Probability of finding an electron in a certain area
• Fixed position of an electron
• Speed of an electron

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9. What happens to electrons in shells further from the nucleus?

• They have less energy
• They have more energy
• They are more stable
• They are less stable

10. Why do electrons repel each other?

• They have opposite charges
• They have the same charge
• They are in fixed orbits
• They are attracted to protons

11. What is the primary characteristic of a neutron?

• It has a positive charge
• It has a negative charge
• It has no charge
• It is found outside the nucleus

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