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Concept/Application Questions
Chapter 9 – Atomic Structure
1. Draw a single atom. Draw and label the following: nucleus, protons, neutrons, electrons and energy level(s).
2. Complete the table below:
Subatomic Part of the
atom
1. Proton
Mass (atomic mass unit)
Charge
2. Neutron
3. Electron
3. The ____________ of the atom determines the mass of the atom.
4. On the Periodic Table, the vertical columns are called _____________ and the horizontal rows are called _____________.
5. The ____________ number on the periodic table tells you the number of protons. The _______ number indicates the number of
____________ and ______________. In a neutral atom, protons always equal ______________.
6. Energy level number (1) in an atom contains a maximum number of __________ electrons. Energy level (2) may contain a
maximum of _______ electrons and energy level number (3) may contain up to ________ electrons.
7. What are valence electrons?
8. Draw a planetary model of a sodium atom (neutral atom) below. Draw in the correct number of electrons in each energy level, the
correct number of protons and neutrons inside the nucleus.
9. Complete the table below:
Element (mass number)
Sodium – 23
Carbon - 12
Chlorine -35
Calcium – 40
Atomic Number
Number of protons
Number of neutrons
Number of electrons
10. What are isotopes? How do they differ from ‘regular’ neutral atoms? Give one example.
11. Name 10 atoms that you would be able to find in the soil of the Earth or in the atmosphere that are naturally occurring.
12. If an atom has 43 electrons, 56 neutrons and 43 protons, it’s approximate atomic mass is _________ amu.
13. What is the difference between the atomic mass of an atom and the average atomic mass?
14. When an electron of an atom jumps to a higher energy level it gives off energy in the form of ___________.
15. Lithium is composed of two different isotopes. Lithium – 7 has a mass of 7.0160 amu and Lithium -6 has a mass of 6.0151 amu.
92.58 percent of all lithium atoms found in nature are Lithium-7 and 7.42 percent are Lithium-6. Calculate the average atomic
mass in amu’s of the lithium atom.