The Periodic Table Of The Elements Page 4
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48. What are the fi ve other elements like helium that are gases and are not very reactive?
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XERCISES
1. Write the name, symbol, atomic number, and average mass for the Group 2 metal in Period 3.
2. Write the name, symbol, average mass, and number of protons for the Group 16 nonmetal in
Period 2.
3. Write the name, symbol, average mass, and number of electrons for the Group 15 metalloid in
Period 4
4. Write the name and symbol of the element that has 48 electrons.
5. Name two elements that have properties similar to sodium, Na. How many valence electrons do
each of these three elements have?
6. Name two elements that have properties similar to bromine, Br. How many valence electrons do
each of these three elements have?
7. Using atomic symbols, list the elements in Period 2 in order of increasing number of electrons.
8. Using atomic symbols, list the elements in Group 14 in order of increasing number of protons.
9. Using atomic symbols, list the elements in Group 12 in order of increasing atomic mass.
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Activity 02-3 Periodic Table of the Elements
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