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History of Atomic Theory (Worksheet)
Q.1. Fill in the blanks with suitable words.
a) The word atom comes from a Greek word that means _______________.
b) Dalton deduced that all elements are composed of _____________.
c) ______________ discovered that there were small particles inside the atom.
d) According to the Bohr Model, electrons travel around the nucleus in well-defined paths
called _______________.
e) Erwin Schrodinger describes the _________________ in 1926.
Q.2. Write T or True if the statement is true; write F or False if the statement is false.
_________ 1. Neutrons orbit the nucleus.
_________ 2. The atomic theory has changed over time.
_________ 3. Protons are positive, electrons are negative, neutrons have no charge.
Q.3. Label the major ideas for atomic models.
Q.4. Who was the first scientist to discover the existence of an atom?
a) Democritus
b) J.J. Thomson
c) Dalton
d) Niels Bohr
Q.5. Who first proposed an atomic theory based on scientific knowledge?
a) Ernest Rutherford
b) J.J. Thomson
c) Dalton
d) Niels Bohr
Q.6. Who first discovered electrons?
a) Ernest Rutherford
c) Dalton
b) J.J. Thomson
d) Niels Bohr
Q.7. Who first discovered neutrons?
a) Erwin Schrodinger
c) Niels Bohr
b) J.J. Thomson
d) James Chadwick
Q.8. Who first discovered protons?
a) Ernest Rutherford
c) Dalton
b) J.J. Thomson
d) Niels Bohr
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Atomic Structure
Counting Subatomic Particles
Name__________________________ Date_____________
Name of
the
Element
23
Silicion
24
25
26
Sodium
27
28 Selenium
29
30
31
Silver
32
33 Tellurium
34
35 Antimony
36
37
Bismuth
38
39
Bromine
40
41 Tungsten
42
43 Manganese
44
Symbol
Atomic
Mass
Number Number
Z
A
14
82
Protons
Neutrons
A-Z
Electrons
73
108
12
45
45
71
28
207
11
35
34
Ti
48
47
56
52
108
137
128
V
51
Cs
w
Cr
35
48
74
24
81
23
28
23
18
22
18
209
133
80
112
55
110
52
25
Mo
42
77
122
Ar
83
22
54
36
96
30
25
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Periodic Table Scavenger Hunt
Using a copy of the periodic table of elements, find the atomic symbol for the following elements
1. Barium
4. Gold
__________
__________
7. Potassium
10. Radon
__________
__________
13. Lanthanum
__________
2. Lead
__________
3. Nitrogen
__________
5. Strontium
__________
6. Lithium
__________
8. Chlorine
__________
9. Cesium
__________
11. Helium
__________
12. Berkelium
14. Bismuth
__________
15. Krypton
__________
__________
Write the name of the element represented by the following atomic symbols
34. Sb
_____________________________
35. C
_____________________________
36. Mn
_____________________________
37. Al
_____________________________
38. Ge
_____________________________
39. Mt
_____________________________
40. Ag
_____________________________
41. Ne
_____________________________
42. P
_____________________________
43. Hg
_____________________________
You will need a periodic table of elements to complete this activity
1. Of the first 103 elements, how many have just one letter in their symbols? _______________
2. How many have two letters in their symbols? _____________
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3. Name some elements that have a one-letter symbol that is also the first letter of the word.
_______________________
_______________________
_______________________
_______________________
_______________________
_______________________
4. Name some elements that have two-letter symbols that are the first letter of the word.
_______________________
_______________________
_______________________
_______________________
_______________________
_______________________
6. Why are their symbols different from their names?
____________________________________________________________________________
7. Name some elements that are named after planets
_______________________
_______________________
_______________________
8. Name some elements after scientists
_______________________
_______________________
_______________________
9. Name some elements named after a city, a state, a country, or a university
_______________________
_______________________
_______________________
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