13.3 Trends across a period

• Chem
• Secondary Education

Lesson 13.3 Trends across a period

Choose an emoji to tell us how you feel today.

😒🙁😐🙂😃

What happens to the atomic size or atomic radius across a period?

1. increases
2. decreases
3. the same

Transition elements are very hard and strong.

TRUE

FALSE

Transition elements are poor conductors of heat and electricity.

TRUE

FALSE

Transition elements have very high melting points and are highly dense materials.

TRUE

FALSE

Transition elements form coloured compounds.

TRUE

FALSE

Transition elements have more than one oxidation states or numbers.

TRUE

FALSE

Oxidation number (variable valency)

• a number given to show whether an element has been oxidised or reduced 
• oxidation number of a simple ion is simply the charge on the ion

Why do transition elements have more than one oxidation number?

Transition elements, as elements or in compounds, are often used as catalysts.

TRUE

FALSE

Compounds containing transition elements in different oxidation states will have different properties and colours.

TRUE

FALSE

Which of the following elements are not transition metals aside from zinc?

1. gold
2. silver
3. iron
4. scandium

Uses of Transition Metals

• Chromium - corrosion resistance 
• Tungsten - incandescent bulb filaments
• Steel - nails
• Vanadium -spanner

Uses of Transition Metals

• Silver - cutlery
• Gold - jack plugs
• Copper - pipe joints
• Iron - magnet
• Titanium - camera body
• Chromium - plated balls

Rate your understanding of the topic using the scale below.

15