ATOMIC PROPERTIES WORKSHOP
CHEMESTRY
SEVENTH GRADE
1. Make the table in your chemistry notebook.
2. Fill the blank spaces with the right number. Remember to use the learned information in
class and the formules. The first row (Na) is an example of how to fill the table.
Elemento
Atomic
number (Z)
Mass
number (A)
Number of
protons
Number of
electrons
Number of
neutrons
Sodio
11
23
11
11
12
23
11
Silicio
14
14
?
?
Cloro
17
Flúor
35
15
19
9
Aluminio
?
?
24
12
Na
?
?
Neutral atom
or Ion
Neutral atom
Si
Cl
?
?
197
79
Oro
Magnesio
Representation
+2
F
Au
-2
Mg
27
13
+3
Al
Ion