Glossary

Actinide - a series of radioactive elements beginning with actinium and endning with lawrencium.

Atomic Number - the amount of protron the atom's nucleau.

Atomic Mass -  the amount of protons and neutrons in an atom.

Chalcogen - the oxygen family. It consists of elements such as oxygen, sulfur, selenium, tellurium and polonium.

Cm^3 - 1 milliliters 

Convalent Bond - occurs when neither atom has sufficient strength to remove the other atom's electron. They would instead share electrons to form stable configurations of electrons.

Density - measurement of space taken up by a substance

Electropositive - tending to release electrons to form a bond in a chemical reaction.

Electronegative - An atom tends to attract electron toward itself when bonding with another atom. The level of attraction of each atom is called electronegativity.

Energy Level - one of the discrete stable energy values that can be assumed by a physical system such as the electrons in an atom or an atomic nucleus.

Halogen - chemical element forming a salt with metal; fluorine, chlorine, bromine, iodine and astatine

Ionic Bond - one atom has sufficient strength of attraction to remove ion from the other atom. 

Ionization Energy - The energy required to remove electrons from an atom.

Isotope - element with same atomic number but different mass. One of the forms of a chemical element that have the same atomic number because they have the same number of protons , but have a different number of neutrons , and therefore have a different mass.

Metallic Bond - reaction between molecules within metals called alkali reactive force. It is the sharing of a sea of delocalised electrons amongst a lattice of positive ions, where the electrons act as a "glue" giving the substance a definite structure.

Mole - a unit for measuring the number of molecules in a substance.

Radioactivity - a form of energy that is produced by a radioactive substance and is harmful in large amounts.

Sythetic - made from artificial materials or substances.

Thermonuclear - nuclear reactions in which atoms join together at very high temperatures and produce a lot of energy.

Transuranic - elements with atomic number that is over 92; higher than Uranium.