Chapter 6 Periodic Table & Trends Study Guide NAME ______________________
If you can answer these questions, you should be able to earn a 100% on the QUEST
tomorrow.
1. What is a period of elements on the periodic table?
A period of elements on the periodic table is a horizontal row in which all the
elements in that row have valence electrons in the same energy level.
2. What is a group of elements on the periodic table?
A group of elements is a vertical column on the periodic table in which all the
elements have the same number of valence electrons.
3. Describe the shielding effect?
The shielding effect is when inner energy levels block the positive pull of the
nucleus for the outer shell electrons, thus making those electrons held less tightly.
4. What is a cation?
A cation is a positive ion.
5. Which is larger, a cation or its corresponding atom? Why?
A cation is smaller than its corresponding atom since it has lost electrons which
gives the atom volume.
6. What is an anion?
An anion is a negative ion.
7. Which is larger, an anion or its corresponding atom? Why?
An anion is larger than its corresponding atom because it has gained electrons
which gives the atom volume.
8. How do the atomic radii vary within a period on the periodic table? Why?
As the atomic number increases the atomic radii of the atoms decreases due to the
increase in the positive negative attraction between the nucleus and electrons.
9. How do the atomic radii vary within a group on the periodic table? Why?
As atomic number increases the atomic radii of the atom increases due to the increase in
the shielding effect as described above and since there are more electrons in more energy
levels.
10. What is ionization energy?
Ionization energy is the energy needed to remove an electron from an atom.
11. How does ionization energy vary within a group on the periodic table? Why?
