Chapter 2
Atoms and Elements
![The Atomic Theory of Matter](https://cloudfront.jove.com/files/media/science-education/science-education-thumbs/11242.jpg)
The earliest recorded discussion of the basic structure of matter comes from ancient Greek philosophers. Leucippus and Democritus argued that all…
![Subatomic Particles](https://cloudfront.jove.com/files/media/science-education/science-education-thumbs/11243.jpg)
Dalton was only partially correct about the particles that make up matter. All matter is composed of atoms, and atoms are composed of three smaller…
![Ions and Ionic Charges](https://cloudfront.jove.com/files/media/science-education/science-education-thumbs/11245.jpg)
In ordinary chemical reactions, the nucleus — which contains the protons and neutrons of each atom and thus identifies the element —…
![The Periodic Table](https://cloudfront.jove.com/files/media/science-education/science-education-thumbs/11246.jpg)
As early chemists discovered more elements, they realized that various elements could be grouped by their similar chemical behaviors. One such…
![Automated <sup>90</sup>Sr Separation and Preconcentration in a Lab-on-Valve System at Ppq Level](https://cloudfront.jove.com/files/thumbs/57722_t.png)
Automated 90Sr Separation and Preconcentration in a Lab-on-Valve System at Ppq Level
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A quick, automated and portable system for the separation and determination of radiostrontium in aqueous samples, using Sr-resin and multi sequential…
![Ion Mobility-Mass Spectrometry Techniques for Determining the Structure and Mechanisms of Metal Ion Recognition and Redox Activity of Metal Binding Oligopeptides](https://cloudfront.jove.com/files/thumbs/60102_t.png)
Electrospray ionization (ESI) can transfer an aqueous-phase peptide or peptide complex to the gas-phase while conserving its mass, overall charge,…
![Preparing an Isotopically Pure <sup>229</sup>Th Ion Beam for Studies of <sup>229m</sup>Th](https://cloudfront.jove.com/files/thumbs/58516_t.png)
Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh
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A methodology is described to generate an isotopically pure 229Th ion beam in the 2+ and 3+ charge states. This ion beam enables one to investigate…