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Einsteinium Symbol:"Es" Atomic Number:"99" Atomic Mass: (252)amu. Einsteinium is one of the elements in the actinide series of inner transition elements. It may also be classified as a rare earth element. It is a radioactive and unstable element and you will not find it in use anywhere. It was named after the physicist Albert Einstein.

More Information: Actinide Series
Elastic Elastic describes a property of rebound. You may have heard of the elasticity of a rubber band. Rubber bands can stretch and return to their original shape. Elasticity of a collision describes how much energy is lost when an object hits. A very elastic surface absorbs little energy and the object will bounce off. A non-elastic surface absorbs a lot of energy and the objects involved in the collision lose energy.

More Information: Solids
Electron Redistribution Redistribution occurs when electrons in a chemical bond are given up, received, or shared by two or more atoms. The concept accepts that electrons will move around the nuclei of several atoms in a chemical bond.

More Information: Bonding
Electron An electron is a very small particle that spins around the center of an atom. An electron has a negative (-) charge and is found in one of seven shells.

More Information: Electrons
Electrovalence Electrovalence is the ability of an element to bond with other elements by giving or receiving an electron. This state of valence can be positive (positive ions) or negative (negative ions). The created bonds are called electrovalent or ionic bonds. Many salts (NaCl) have electrovalent bonds.

More Information: Bonding
Electrovalent Bond A chemical bond that occurs between two atoms when one or more electrons are passed from one atom to another. When they exchange electrons, each of the atoms should have a filled shell. A good example of an ionic bond is the sodium chloride bond. You may also hear the term ionic bond.

More Information: Bonding
Equivalent The equivalent is the mass of a compound that could replace the atomic mass of an element. An example would be the amount of substance to replace one gram of hydrogen or fourteen grams of nitrogen.

More Information: Stoichiometry
Equivalent Mass The equivalent mass is molecular mass of a substance divided by the valence of that compound. Valence is determined by multiplying the valence of the positive ion in a compound by the number of atoms of that ion. NaCl has one positive sodium atom with a valence of one. 1 x 1 gives a positive valence of 1.

More Information: Stoichiometry
Erbium Symbol:"Er" Atomic Number:"68" Atomic Mass: 167.26amu. Erbium is one of the elements in the lanthanide series of inner transition elements. It may also be classified as a rare earth element.

More Information: Lanthanide Series
Europium Symbol:"Eu" Atomic Number:"63" Atomic Mass: 151.96amu. Europium is one of the elements in the lanthanide series of inner transition elements. It may also be classified as a rare earth element.

More Information: Lanthanide Series
Evaporation Evaporation is a molecular phase change of a liquid to gas or vapor. The overall temperature of the system is not near the boiling point. While the average temperature of a liquid may be low, some molecules have high temperatures and high energy. Those molecules with higher energies are able to escape the system and become a gas. The molecules evaporate one by one.

More Information: Evaporation
Extraction Extraction is the process of taking a solvent and using it to dissolve a compound from a mixture. If you want to remove salt from a mixture of salt and iron filings, you can pour water on the mixture. The salt will dissolve in the water (solvent).

More Information: Mixtures






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