The document discusses the periodic table and its organization. It explains that the periodic table arranges elements in order of increasing atomic number and decreasing atomic mass. The vertical columns of elements with similar properties are called groups, while the horizontal rows are called periods. The document provides practice problems to test finding the position of various elements in the periodic table based on their atomic number and mass.

1. The Periodic Table
14/10/2022

2. Substances can be classified as elements or
compounds.
• An element is
________________________________________________________
• A compound is
________________________________________________________

3. In the Periodic Table:
• the elements are
arranged in order of
________________________
________________________
• the vertical columns
of elements with
similar properties are
called _________________
• the horizontal rows
are called ______________

4. Complete the blanks below!

5. Practice to find out the position of elements in the periodic table
1.

6. Practice to find out the position of elements in the periodic table
2.
K
39
19

7. Practice to find out the position of elements in the periodic table
3.
Ar
40
18

8. Practice to find out the position of elements in the periodic table
4.
O
16
8

9. Practice to find out the position of elements in the periodic table
5.
Si
28
14

10. Practice to find out the position of elements in the periodic table
6.
Ba
11
5 Al
27
13 Ga
70
31 In
115
49

11. Practice to find out the position of elements in the periodic table
7.
Na
11
5 Al
27
13
Mg
24
12

12. Find out the position of each element
in the periodic table!
8. The following is a list of the electron
distributions of unknown elements.
Answer:

13. 9.

15. 10.