Page 37 - Chemistry_Form_2

Chemistry
for Secondary Schools

Element Electronic configuration Group Period

Magnesium
Aluminium

Potassium
FOR ONLINE READING ONLY
Nitrogen
Sulfur

2. Argon and sodium are in the same period but behave differently. Use their
electronic configurations to justify their differences.

3. How does an element’s electronic configuration determine its position in the
periodic table? Provide examples.

4. Why do elements in the same group of the periodic table have similar
chemical properties?
5. Predict the position of an element with the electronic configuration 2: 8: 3 in
the periodic table and justify your answer.

Task 2.3
Sketch a modern periodic table on manila paper using a pencil and ruler, ensuring

clear rows for periods and columns for groups. Use different coloured marker pens
to assign a distinct colour to each group. Then, fill each block with the chemical
symbol, atomic number, and relative atomic mass of the corresponding elements.

Select one element from each group and write its electronic configuration below its
corresponding block to illustrate its relationship with its position in the periodic table.

Trends in physical and chemical properties across periods and down

groups

Task 2.4

Utilise reliable online resources to search and analyse trends in the periodic table
and describe how the properties of elements vary across the periods and down
the groups.

30 Student’s Book Form Two

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