atomic structure

• What is the approximate radius of an atom?

  $1 \times 10^{-10} \text{ m}$
• How does the radius of the nucleus compare to the radius of an atom?

  The nucleus is less than 1/1000th the radius
• Where is most of the mass of an atom concentrated?

  In the nucleus
• What two particles are found in the nucleus?

  Protons and neutrons
• What charge do protons have?

  Positive charge
• What charge do neutrons have?

  No charge
• What is the overall charge of the nucleus?

  Overall positive charge
• What charge do electrons have?

  Negative charge
• Where are electrons found in an atom?

  In energy levels around the nucleus
• How does the energy of an electron relate to its distance from the nucleus?

  Further electrons have higher energy
• What happens to an electron when it absorbs electromagnetic radiation?

  It moves to a higher energy level
• What occurs when an electron emits electromagnetic radiation?

  It returns to a lower energy level
• What are the key concepts related to the structure of atoms?

  • Atoms are very small
  • Radius of an atom: $1 \times 10^{-10} \text{ m}$
  • Nucleus is tiny compared to the atom
  • Nucleus contains protons (positive) and neutrons (neutral)
  • Electrons (negative) are found in energy levels
  • Energy levels further from the nucleus have higher energy
  • Electrons can change energy levels by absorbing or emitting radiation
• What should you do if you want to find more questions on the structure of atoms?

  Refer to the vision workbook