Name: _____________________________________
Date: ________________________________
Science 10: Chemistry
Atoms and The Periodic Table Worksheet
1. Define chemistry.
2. Define atom.
3. The three parts of an atom and their respective charges are :
4. The atomic number of an atom tells you the number of ____________________.
If the atom is neutral the atomic number also gives the number of ____________________.
No two elements will have the ____________________ atomic number.
5. The atomic mass of an atom can be used to determine the number of ____________________.
First ____________________ the atomic mass and then complete the following equation:
# of Neutrons = ____________________ – ____________________.
Use your periodic table to complete the following:
6. Give the symbol and number of protons in one atom of:
Lithium
____________________
Bromine
____________________
Iron
____________________
Copper
____________________
Oxygen
____________________
Mercury
____________________
Krypton
____________________
Helium
____________________
7. Give the symbol and number of electrons in a neutral atom of:
Uranium
____________________
Chlorine
____________________
Boron
____________________
Iodine
____________________
Antimony ____________________
Xenon
____________________
8. Give the symbol and number of neutrons in one atom of:
Barium
____________________
Bismuth
____________________
Carbon
____________________
Hydrogen
____________________
Fluorine
____________________
Magnesium
____________________
Mercury
____________________
Europium ____________________
9. Name the element which has the following number of particles:
26 electrons, 29 neutrons, 26 protons
____________________
53 protons, 74 neutrons
____________________
2 electrons (neutral atom)
____________________
20 protons
____________________
0 neutrons
____________________
10. If you know only the following information, can you always determine what the element is? Yes or no?
Number of protons
____________________
Number of neutrons
____________________
Number of electrons in a neutral atom
____________________
Number of electrons
____________________