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A noncrystalline solid with no well-defined ordered structure.

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Total Ionic Equation

Equation for a chemical reaction written to show the predominant form of all species in aqueous solution or in contact with water.

Half-Life

The time required for half of a reactant to be converted into product(s). The time required for half of a given sample to undergo radioactive decay.

Beta Particle

Electron emitted from the nucleus when a neuton decays to a proton and an electron.

Neutron

A neutral subatomic particle having a mass of 1.0087 amu.

Acid

A substance that produces H+(aq) ions in aqueous solution. Strong acids ionize completely or almost completely in dilute aqueous solution. Weak acids ionize only slightly. Chemicals or substances having the property of an acid are said to be acidic.

Capillary

A tube having a very small inside diameter.

The most expensive metal in the world

Do you think the most expensive metal is gold? No! On earth there are more valuable metals. But we need to divide the value of metals that occur in nature, and metals - isotopes, which are obtained in special laboratories. Let’s look at natural metals first.

Halogens

Group VIIA elements: F, Cl, Br, I

Potential Energy

Energy that matter possesses by virtue of its position, condition or composition.

Nuclear Reaction

Involves a change in the composition of a nucleus and can evolve or absorb an extraordinarily large amount of energy.