Study Notes
The properties of materials include understanding periodic trends, group 1 elements, and density. The periodic table arranges elements by increasing atomic number, with groups and periods indicating similar properties and electron configurations.
- Periodic Table — a chart where elements are organized by increasing atomic number. Example: Elements in the same group have similar chemical properties.
- Period — horizontal rows on the periodic table indicating the number of electron shells. Example: Elements in period 2 have two electron shells.
- Group — vertical columns on the periodic table showing the number of outer electrons. Example: Group 1 elements have one electron in their outer shell.
- Density — the mass of a substance divided by its volume. Example: Water is less dense as a solid than as a liquid, which is why ice floats.
Exam Tips
Key Definitions to Remember
- Periodic Table: Arrangement of elements by increasing atomic number.
- Group: Vertical columns in the periodic table indicating the number of outer electrons.
- Density: Mass divided by volume of a substance.
Common Confusions
- Confusing periods with groups on the periodic table.
- Misunderstanding why ice floats on water.
Typical Exam Questions
- What is a period on the periodic table? A horizontal row indicating the number of electron shells.
- How does the reactivity of group 1 elements change down the group? Reactivity increases as you go down the group.
- How is density calculated? Density is calculated as mass divided by volume.
What Examiners Usually Test
- Understanding of periodic trends and how they relate to element properties.
- Ability to explain the properties and reactivity of group 1 elements.
- Calculation and understanding of density and its implications for different states of matter.