Name __________________________
ELEMENTS AND COMPOUNDS
1. What is an element? Give 2 examples.
2. What is a compound? Give 2 examples.
3. Why is H2O a compound?
4. What is a chemical symbol? Give 2 examples.
5. What is a chemical formula? Give 2 examples.
6. How many different elements make up each compound?
a. CO2 = _______
b. C6H12O6 = ________
c. H2O = __________
d. Na2SO4 = __________
7. What is the trick to tell how many different elements in the compound?
8. Circle the examples that are compounds?
H2O
Ca
FeO
HCl
He
H 2O 2
Au
THE PERIODIC TABLE
1. How is the Periodic Table arranged?
2. What are the names of these elements?
Hg = _____________
Fe = _____________
H = _____________
O = _______________
Au = _____________
N = _____________
C = _____________
Na = _____________
He = _____________
3. Define: period
4. Define: family/group:
5. What element is in the 4th period, 5th family?
6. What element is in the 6th period, 1st family?
7. What element is in the 3rd period, 2nd family?
8. Circle the element that does NOT belong to the same period.
K
Sc
Zn
Hg
Se
Kr
9. Circle the element that does NOT belong to the same group.
H
Na
Rb
He
K
Fr
10. In which group are noble gases located?
11. Circle which conducts heat best?
Metals
nonmetals metalloids
12. How do you find an element’s atomic number?
13. What does the atomic number represent?
14. How do you find an element’s atomic mass?
15. What does the atomic mass represent?
16. Define: proton
How do you find the number of protons?
17. Define: electron
How do you find the number of electrons?
18. Define: neutron
How do you find the number of neutrons
Name _____________________
Drawing an Atom
* Remember: Protons and neutrons are in the nucleus (center) of an atom.
Electrons are found on energy levels surrounding the nucleus of the atom.
You find the number of protons by looking at the ____________
You find the number of electrons by looking at the ____________
How do you find the number of neutrons? _______________________________
**Energy levels hold a specific number of electrons.
a. How many electrons can the first energy level hold? ______
b. How many electrons can the second energy level hold? ____
c. How many electrons can the third energy level hold? ______
What do particles marked + represent? ___________________________
What do particles marked – represent? ___________________________
Draw an atom’s electron configuration and nucleus using the following information.
N = Nitrogen
Atomic Mass = 14
Atomic Number = 7
# of Protons = 7
# of Electrons = 7
# of Neutrons = 7 (14 -7 = 7)
Draw an atom of Boron
Atomic Mass = _____
Atomic Number = ______
# of Protons = ______
# of Electrons = ______
# of Neutrons = ______
Draw an atom of Oxygen
Atomic Mass = _____
Atomic Number = ______
# of Protons = ______
# of Electrons = ______
# of Neutrons = ______
7P
7N
1. The number of protons and neutrons in the nucleus of an atom make up its _______.
2. The atomic number of an atom with 6 protons, 6 electrons and 6 neutrons is ______.
3. Which element has 12 protons? ____________________
4. Which element has 26 protons? _____________________
5. Which element has 13 electrons? _____________________
6. Which element has 20 electrons? ______________________
7. Which element has 2 protons and 2 neutrons in its nucleus? __________
8. Which element has 13 protons and 14 neutrons in its nucleus? _____________
9. What is the atomic number of Magnesium? ____________
10. What is the atomic number of chlorine? _____________________
11. What is the atomic number of sodium? _____________________
12. What is the atomic mass of sodium? ________________________
13. What is the atomic mass of aluminum? ______________________
14. Which of these elements have the greatest atomic mass? Circle the answer.
Ag
O
Mg
Cu
15. Which element has the greatest atomic mass? Circle the answer.
N
16.
17.
18.
19.
20.
B
Fe
Au
What is the symbol for Mercury? ______________
What is the symbol for Chlorine? __________________
What is the symbol for sodium? _________________
How many electrons are on the outer energy level of a carbon atom? ________
Hint: Remember how many electrons can be held on each level.
How many electrons are on the outer energy level of a Fluorine atom? _______