Chemistry 1

• Electron configuration
• What are ions?

  Charged particles formed from atoms
• What are elements?

  Pure substances made of one type of atom
• What does the history of atoms refer to?

  The development of atomic theory over time
• What are methods for separating mixtures?

  Techniques used to isolate components of mixtures
• What is the relationship between elements and atoms?

  Elements consist of many identical atoms
• What is an atom?

  The smallest unit that can participate in reactions
• How is an element defined?

  As many of the same type of atom
• What are compounds?

  Substances made of different types of atoms
• How are compounds formed?

  By chemically bonding different types of atoms
• What are the three main subatomic particles in an atom?

  Protons, neutrons, and electrons
• What charge do protons have?

  Positive charge
• Where are protons located in an atom?

  In the nucleus
• What charge do neutrons have?

  No charge
• Where are neutrons located in an atom?

  In the nucleus
• What charge do electrons have?

  Negative charge
• Where are electrons located in an atom?

  In shells around the nucleus
• What happens to atoms during a chemical reaction?

  • Atoms rearrange themselves
  • Bonds between atoms break and form
  • New substances are created
• What is the chemical equation for the reaction of magnesium and oxygen?

  mg + O₂ = 2mgO₂
• What does the equation mg + O₂ = 2mgO₂ represent?

  A chemical reaction between magnesium and oxygen