1.1.1 The Dalton Model of the Atom

• Who proposed the Dalton Model of the Atom?

  John Dalton
• All atoms of a given element are identical in mass and properties according to the Dalton Model.


  True
• What did Dalton discover?

  All matter is made of atoms
• What are the key features of the Schrodinger model of the atom?

  • Electrons exhibit wave-like behavior
  • Electrons occupy probability distributions (orbitals) around the nucleus
  • Orbitals have specific quantum numbers (n, l, m)
  • Electrons can only occupy certain allowed energy levels
• How are compounds formed according to the Dalton Model?

  Combining atoms in fixed ratios
• What did Thomson discover?

  Discovered the inner structure of the atom
• What foundational understanding did the Dalton Model provide?

  Element and compound formation
• Match the postulate with its description:

  Atoms ↔️ All matter is composed of indivisible atoms

  Elements ↔️ All atoms of a given element are identical

  Compounds ↔️ Compounds are formed by combining atoms

  Chemical Reactions ↔️ Atoms are rearranged, not created or destroyed
• For what type of chemical reactions is the Dalton Model applicable?

  Simple chemical reactions
• When was the Dalton atomic model proposed?

  1808
• The modern atomic model includes the concept of isotopes.

  True
• What are the fundamental particles in Dalton's Atomic Theory called?

  Atoms
• What smaller particles are atoms made of?

  Protons, neutrons, electrons
• Atoms of the same element can have different numbers of neutrons.


  True
• Order the aspects of the Dalton Model according to its implications, limitations, and contributions.

  1️⃣ Implications: Defined element and compound formation

  2️⃣ Limitations: No subatomic particles accounted for

  3️⃣ Contributions: Provided foundational understanding
• What did Dalton believe about atoms in chemical reactions?

  They are rearranged
• What did Rutherford discover?

  Discovered electrons surround the nucleus of an atom
• The Dalton Model accounted for the existence of subatomic particles such as protons and electrons.

  False
• What does the Dalton model say about the composition of compounds?

  Fixed ratios
• What analogy did Dalton use to describe the formation of compounds?

  Cooking recipes
• Atoms of the same element have the same mass and properties.


  True
• What did Dalton believe about atoms of the same element?

  Atoms are identical
• What are the key features of the Bohr model of the atom?

  • Electrons move in fixed orbits (shells) around the nucleus
  • Electrons can only occupy certain allowed energy levels
  • Electrons absorb or emit energy when moving between energy levels
• What did Dalton assume about the divisibility of atoms?

  Atoms are indivisible
• Dalton's assumption that atoms of the same element are identical is true.

  False