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Ch. 5 Worksheet
Ch. 5-1 + 5-2 The Atom
1. What did Democritus contribute to the theory of atoms? ______________________________
______________________________________________________________________________
2. Two of the four parts of Dalton's Atomic Theory are incorrect. Rewrite the two incorrect
statements so that they are true.
a. ______________________________________________________________________
______________________________________________________________________
b. ______________________________________________________________________
______________________________________________________________________
3. Describe the contributions to atomic theory made by Thomson's experiments with a cathode
ray tube.
______________________________________________________________________________
______________________________________________________________________________
and Rutherford's work with gold foil.
______________________________________________________________________________
______________________________________________________________________________
4. Describe the structure of the atom using complete sentences. The terms electron, proton,
neutron, nucleus, mass, and charge should be included in your description (underline/highlight
these words in your paragraph).
______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________
______________________________________________________________________________
Ch.5.3
5. What is the atomic number of an element? _________________________________________
In an atom, how are the number of protons and electrons related? ______________________
How is the number of electrons related to the atomic number? _________________________
6. What is the mass number of an atom? _____________________________________________
7. For each diagram, list the atomic number and mass number. A periodic table can be used to
find the symbol for each atom. Put a star on the isotopes.
1e
9e
7e
1e
6e
1p
9p
7p
1p
6p
10n
7n
1n
8n
Atomic number 1
Mass number 1
Symbol
H
___
___
___
___
___
___
___
___
___
___
___
___
8. The composition of an atom can be represented with a chemical symbol using a superscript
and a subscript. Label the atomic number and mass number for the following chemical symbol.
This element can also be represented as gold - _________
___________197
___________ 79 Au
9. Atoms that have the same number of ___________ but different numbers of ____________
are called _____________. Write the superscript/subscript chemical symbols for the two
isotopes from question #7. ______________, _____________
10. What is an atomic mass unit (amu)? _____________________________________________
______________________________________________________________________________
11. The atomic mass of an element is _______________________________________________
______________________________________________________________________________
12. Below is an element as represented on the Periodic Table.
a. To the right label the atomic mass and atomic number.
3
b. Below state the number of protons, electrons, and
Li
neutrons found in this element.
6.941
p+_________ e- ________ n° ___________
c. Explain why the atomic masses for most elements are not whole numbers.
________________________________________________________________________
________________________________________________________________________
Ch.5.4 Organizing the Elements
13. Who assembled the first periodic table? __________________________________________
14. The modern periodic table is arranged according to increasing ________________________
15. The horizontal rows are called _______________________. How many are there? ________
16. The vertical columns are called ____________ or ______________. How do all of the
elements in a vertical column compare? __________________________________________
17. Name two elements that have properties similar to those of calcium. _______ and ________
18. List four common properties of all elements that are metals.
a. _______________________________________________
b. _______________________________________________
c. _______________________________________________
d. _______________________________________________
Use a periodic table to list the symbols of any five metals. ___________________________
19. List four common properties of nonmetals.
a. _______________________________________________
b. _______________________________________________
c. _______________________________________________
d. _______________________________________________
List the symbols of any five nonmetals. __________________________________________
20. How do the properties of metalloids compare to those of metals and nonmetals? __________
___________________________________________________________________________
Where are the metalloids found on the periodic table? _______________________________
List the symbols of all 7 metalloids. _____________________________________________
21. How many elements are there? __________________