This is a Clilstore unit. You can .
LESSON 2
The order of the elements in the Periodic Table
In the current table, the elements are placed in ascending order of atomic numbers and arranged in 18 groups (vertical columns) and 7 periods (horizontal rows).
The number of elements in each group varies. There are eight lengthy groups: 1, 2, 13, 14, 15, 16, 17 and 18, which include the so-called main-group elements and 10 short groups: 3, 4, 5, 6, 7, 8, 11 and 12, which collect the transition elements.
Some of the groups are known with specific names. Of all those names, the most used are Alkali metals, Alkaline earth metals, Halogens and Noble gases.
The shortest period is 1, which has only two elements, and the longest are periods 6 (Lanthanides) and 7 (Actinides), which have 32 elements. In order for the periodic table not to be too horizontal, some elements of periods 6 and 7, called rare earth elements, are usually separated at the bottom.
The elements’ properties according to their placement in the table
Knowing the order of the elements in the Periodic Table allows us to predict their properties, since all the elements that belong to the same group or period have similar properties.
Task 1
Visualize the following BBC video about the elements’ properties according to their position in the Periodic Table. Do not forget to answer the questions at the end of the video!
BBC Video and Test: http://www.bbc.co.uk/education/guides/zb3j6sg/activity
Task 2
Practice what you have learned in this lesson:
Short url: https://clilstore.eu/cs/5419
