Essay Quiz


1		What reason did Dalton have for bringing back the ancient Greek idea of matter being composed of hard, indivisible atoms?



2		What was the experimental evidence that Thomson had discovered the existence of a subatomic particle when working with cathode rays?



3		Describe the experimental evidence that led Rutherford to the concept of a nucleus in an atom.



4		What is the main problem with a solar system model of the atom?



5		Compare the size of an atom to the size of its nucleus.



6		What does atomic number mean? How does the atomic number identify the atoms of a particular element? How is the atomic number related to the number of electrons in an atom?



7		An atom has 11 protons in the nucleus. What is the atomic number? What is the name of this element? What is the electron configuration of this atom?



8		Describe the three main points in the Bohr model of the atom.



9		Why do the energies of electrons in an atom have negative values? (Hint: It is not because of the charge of the electron.)



10		Which has the lowest energy, an electron in the first energy level (n = 1) or an electron in the third energy level (n = 3)? Explain.



11		What is similar about the Bohr model of the atom and the quantum mechanical model? What are the fundamental differences?



12		What is the difference between a hydrogen atom in the ground state and one in the excited state?

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