Development of Atomic Models

These flashcards cover key terms and concepts associated with the development of atomic models, providing a foundation for understanding atomic structure and behavior.

Theory

In science, a coherent explanation supported by overwhelming evidence that allows room for doubt and revision.

Atomic Theory

The theory that all matter is made up of atoms, aiding in the prediction of matter's behavior.

Model

A simplified representation used to explain complex structures or phenomena.

Dalton's Model

Proposed that atoms are solid spheres; laid the foundation for modern atomic theory.

Cathode Ray

A stream of charged particles (electrons) observed in vacuum tubes, leading to discoveries about atomic structure.

Plum Pudding Model

Thomson's atomic model suggesting electrons are embedded in a positively charged 'pudding'.

Nucleus

The dense, positively charged core of an atom containing protons and neutrons.

Bohr Model

An atomic model featuring electrons orbiting the nucleus in fixed paths or quantized orbits.

Proton

A positively charged particle found in the nucleus.

Neutron

A neutral particle found in the nucleus alongside protons.

Electron Cloud Model

A model suggesting the positions of electrons are based on probabilities rather than fixed orbits.

Quantum Mechanics

The branch of physics dealing with the behavior of materials at the atomic and subatomic levels.

Brownian Motion

The erratic movement of microscopic particles suspended in a fluid, providing evidence for the existence of atoms.

Corpuscles

The term originally used by Thomson to describe particles (electrons) smaller than atoms.

Energy Levels

Fixed paths where electrons may reside, each with a specific quantized energy.

Spectral Lines

Emissions from electrons transitioning between energy levels, producing unique light signatures.