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Ion List by Tournament Level

Casadevall, Acting Director The use of firm, trade, and brand names in this report is for identification purposes only and does not constitute endorsement by the US. Government Library of Congress Cataloging-in-Publications Data Ground water and surface water : a single resource / by Thomas C. Winter [et al] p cm -- (US. Geological Survey circular : 1139) Includes bibliographical references. 1. Hydrology. I. Winter, Thomas C. II. Series. GB6612G76 98–2686 5537—dc21 CIP ISBN 0–607–89339–7 US. GOVERNMENT PRINTING OFFICE : 1998 Free on application to the US.

Figures (7)

A sodium cation is solvated by water molecules with their partially negative charged lone pairs pointing inwards towards the positively charged sodium ion
Electron transfer from a neutral lithium (Li) atom on the left to a neutral fluorine (F) atom on the right would give Li+ and F− ions.
Hydrogen atom (center) contains a single proton and a single electron. Removal of the electron gives a cation (left), whereas the addition of an electron gives an anion (right). The hydrogen anion, with its loosely held two-electron cloud, has a larger radius than the neutral atom, which in turn is much larger than the bare proton of the cation. Hydrogen forms the only charge-+1 cation that has no electrons, but even cations that (unlike hydrogen) retain one or more electrons are still smaller than the neutral atoms or molecules from which they are derived.
Mixed Roman numerals and charge notations for the uranyl ion. The oxidation state of the metal is shown as superscripted Roman numerals, whereas the charge of the entire complex is shown by the angle symbol together with the magnitude and sign of the net charge.
Schematic of an ion chamber, showing drift of ions. Electrons drift faster than positive ions due to their much smaller mass.[5]
Avalanche effect between two electrodes. The original ionization event liberates one electron, and each subsequent collision liberates a further electron, so two electrons emerge from each collision: the ionizing electron and the liberated electron.
An electrostatic potential map of the nitrate ion (NO−3). The 3-dimensional shell represents a single arbitrary isopotential.

Key Points

  • Ion exchange is the process that takes place in water softeners; ions that contribute to water hardness—calcium and magnesium—are exchanged for sodium on the surface of the solid.
  • Ammonium, a major component of fertilizer and manure, is very soluble in water, and increased concentrations of nitrate that result from nitrification of ammonium commonly are present in both ground water and surface water associated with agricultural lands (see Box O).
  • An example is the release of calcium ions (Ca++) and bicarbonate ions (HCO3 −) when calcite (CaCO3) in limestone is dissolved.
  • Carbonate reefs and carbonate sediments form in tropical regions where there is little input of clastic sediments.
  • At these locations, the solid material iron hydroxide is formed when iron dissolved in ground water comes in contact with oxygen dissolved in surface water.
  • Nitrate concentrations are increasing in much of the Nation's water, but they are particularly high in ground water in the midcontinent region of the United States.

Terms

Tap a term for a plain-language explanation.

Sources & licensing(4)