Podcast
Questions and Answers
Which of the following statements accurately reflects a core tenet of Dalton's atomic theory?
Which of the following statements accurately reflects a core tenet of Dalton's atomic theory?
- Atoms cannot be subdivided, created, or destroyed. (correct)
- Atoms of a given element can be subdivided into smaller particles with varying properties.
- Atoms are composed of positively charged particles scattered within a negatively charged matrix.
- Atoms of different elements are identical in size, mass, and other properties.
Rutherford's model of the atom proposed that electrons could occupy any energy level around the nucleus.
Rutherford's model of the atom proposed that electrons could occupy any energy level around the nucleus.
False (B)
Briefly explain the key difference between elementary particles and composite particles, providing an example of each.
Briefly explain the key difference between elementary particles and composite particles, providing an example of each.
Elementary particles are indivisible and not made up of other particles (e.g., electrons), while composite particles are made up of smaller particles (e.g., protons).
The process of a substance changing directly from a solid to a gas is known as ______.
The process of a substance changing directly from a solid to a gas is known as ______.
Match each scientist with their contribution to the development of atomic theory:
Match each scientist with their contribution to the development of atomic theory:
Flashcards
Democritus's Idea
Democritus's Idea
Matter is composed of indivisible, tiny particles called 'atomos'.
Dalton's Atomic Theory
Dalton's Atomic Theory
All matter has atoms, which can't be created/destroyed. Atoms of an element are identical.
Plum Pudding Model
Plum Pudding Model
Electrons are scattered throughout a positive charge.
Bohr Model
Bohr Model
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Atom
Atom
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Study Notes
- Demartius proposed that matter consists of tiny, indivisible particles called Atomos.
- John Dalton developed the Dalton Atomic Theory.
- All matter is composed of atoms.
- Atoms cannot be subdivided, created, or destroyed.
- Atoms of a given element are identical in properties.
- Atoms of different elements differ in properties.
- Dalton's theory laid the foundation for the modern atomic model.
- Scientists used the cathode ray tube to discover positively and negatively charged particles.
- JJ Thomson proposed the Plum Pudding Model.
- Thomson experimented with the cathode ray tube to find the charge-to-mass ratio.
- The Plum Pudding Model describes electrons scattered throughout an atom.
- Rutherford developed the Rutherford model.
- Rutherford conducted the gold foil experiment.
- Niels Bohr proposed that electrons surrounding the nucleus exist only in specific energy levels where larger shells have higher energy.
Phase Changes
- Vaporization is the change of water into gas.
- Condensation is the change of gas into water.
- Sublimation is the change of solid into gas.
- Deposition is the change of gas into solid.
Atomic Particles
- Protons are positively charged composite particles.
- Neutrons have no charge and are composite particles.
- Electrons are negatively charged particles.
- Atoms are the smallest particle of an element that retains the element's properties.
- Protons and neutrons contain elementary particles called gluons.
- Gluons bind protons and neutrons together.
- Leptons are elementary particles that cannot be broken down.
- Elementary particles are indivisible and not made of other particles.
- Examples of elementary particles include electrons, quarks, and fundamental bosons.
- Quarks are elementary particles that comprise protons and neutrons.
- Composite particles are made up of smaller particles.
- Examples of composite particles include protons, neutrons, and mesons.
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Description
Brief description of the atomic theory and models including Demartius's Atomos theory and John Dalton's Atomic Theory. Includes the Plum Pudding Model. Also covers Rutherford's gold foil experiment, and Niels Bohr's model of electron energy levels.
