PERIODIC TRENDS

• What are periodic trends?

  Patterns in properties of elements
• How can scientists use periodic trends?

  To predict element behavior in reactions
• What properties show predictable patterns in elements?

  Size, reactivity, and electron gain/loss
• Why do periodic trends occur?

  Due to atomic structure and electron arrangement
• What is the atomic structure of an atom?

  Nucleus with protons and neutrons, surrounded by electrons
• How does the atomic structure change across a period or down a group?

  The number of protons, neutrons, and electrons changes
• What role does electron arrangement play in chemical behavior?

  Determines how elements react chemically
• What do elements in the same group have in common?

  Same number of electrons in their outer shell
• Why do elements in the same group often react similarly?

  They have the same outer shell electron configuration