Thursday_19: Arrangement of elements

• Chemistry
• Secondary Education

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CHEMISTRY 9

14 - Arrangement of elements

• I can describe the Periodic Table as an arrangement of elements in periods and groups.
• I can describe the change from metallic to non-metallic character across a period.
• I can explain how the position of an element in the Periodic Table can be used to predict its properties.

What do I remember from the previous lesson?

A student is given a mixture of calcium sulfate, magnesium chloride and water. The table below shows some information about calcium sulfate and magnesium chloride.

How does the student obtain magnesium chloride crystals from the mixture?

1. Crystallisation followed by distillation
2. Crystallisation followed by filtration
3. Distillation followed by crystallisation
4. Filtration followed by crystallisation

Metals

Non-metals

Dmitri Mendeleev

Elements

• essential substances that make up all matter
• 90 elements naturally exist in the universe
• made up of only a single kind of atom
• has a symbol to make life easier

Group

Group

Period

Group

Period

Vertical columns

Horizontal rows

Main Groups

• Boring Silly Goats Are At The Party.

• atomic number

• element symbol

• element name

• mass number

• atomic number

• element symbol

• element name

• mass number

• atomic number

• element symbol

• element name

• mass number

Periodic Trends

• are specific patterns in the periodic table that illustrate different properties of a particular element, including its physical and chemical properties

metallic character increases

Which of the following elements is the most metallic?

1. Sodium (Na)
2. Potassium (K)
3. Rubidium (Rb)
4. Caesium (Cs)

Which of the following elements is the most metallic?

1. Beryllium (Be)
2. Calcium (Ca)
3. Radium (Ra)
4. Barium (Ba

Which of the following elements is the least metallic?

1. Sodium (Na)
2. Magnesium (Mg)
3. Aluminium (Al)
4. Phosphorus (P)

Which of the following elements is the most non-metallic?

1. Sodium (Na)
2. Magnesium (Mg)
3. Aluminium (Al)
4. Phosphorus (P)

Which of the following elements is the least metallic?

1. Carbon (C)
2. Silicon (Si)
3. Germanium (Ge)
4. Tin (Sn)

Which is more metallic:
Silver or Gold? Explain your answer.

Which is more metallic:
Potassium or Calcium?
Explain your answer.

• Open your Workbook on pages 147 and 148.
• Complete Focus Question 1.
• Fill in the first 8 blanks only.
• Use your pen to complete your task.

Check for Understanding