2.2: The Discovery of Atomic Structure is shared under a CC BY-NC-SA 3.0 license and was authored, remixed, and/or curated by LibreTexts. According to atomism, matter consists of discrete particles. The word 'atom' comes from the ancient Greek word atomos, which means indivisible. However, the discovery of subatomic particles (such as protons, electrons, and neutrons) disproved this postulate. Three important kinds of radiation are particles (helium nuclei), particles (electrons traveling at high speed), and rays (similar to x-rays but higher in energy). Atomic theory originated as a philosophical concept in ancient India and Greece. A possible pair of compounds that would fit this relationship would be A = CO 2 and B = CO.Ī sample of compound X (a clear, colorless, combustible liquid with a noticeable odor) is analyzed and found to contain 14.13 g carbon and 2.96 g hydrogen. It does not account for subatomic particles: Dalton’s atomic theory stated that atoms were indivisible. Define isotopes and give examples for several elements. Describe the three subatomic particles that compose atoms. Summarize and interpret the results of the experiments of Thomson, Millikan, and Rutherford. This means that A and B are different compounds, with A having one-half as much carbon per amount of oxygen (or twice as much oxygen per amount of carbon) as B. By the end of this section, you will be able to: Outline milestones in the development of modern atomic theory. This comprises ions, neutral atoms and, unless otherwise stated, it can be assumed that the term. 1 It is primarily concerned with the way in which electrons are arranged around the nucleus and the processes by which these arrangements change. The Ancient Greek theory has been credited to several different scholars but is most often attributed to Democritus (460370 BC) and his mentor Leucippus. Atomic physics typically refers to the study of atomic structure and the interaction between atoms. This supports the law of multiple proportions. The word ‘atom’ actually comes from Ancient Greek and roughly translates as ‘indivisible’.
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