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Questions for Thought
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1

Describe the experimental evidence that led Rutherford to the concept of a nucleus in an atom.
2

What is the main problem with a solar system model of the atom?
3

Compare the size of an atom to the size of its nucleus.
4

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?
5

Why do the energies of electrons in an atom have negative values? (Hint: It is not because of the charge of the electron.)
6

What is similar about the Bohr model of the atom and the quantum mechanical model? What are the fundamental differences?
7

What is the difference between a hydrogen atom in the ground state and one in the excited state?
8

Which of the following are whole numbers, and which are not whole numbers? Explain why for each.
    (a) atomic number
    (b) isotope mass
    (c) mass number
    (d) atomic weight
9

Why does the carbon-12 isotope have a whole-number mass but not the other isotopes?
10

What do the members of the noble gas family have in common? What are their differences?
11

How are the isotopes of an element similar? How are they different?
12

What patterns are noted in the electron structures of elements found in a period and in a family in the periodic table?





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