(still Lesson 3)
One of the elements in Group 13 through the periodic table periodic table
Transitional Metal
an element that lacks most of the properties of a metal
Nonmetals
A substance that can conduct electric current under some conditions
Semiconductor
The process of determining the age of an object using the half-life of one or more radioactive
Radioactive Decay
Electromagnetic waves with the shortest wavelengths and highest frequencies
Gamma Ray
A molecule consisting of two atoms
Diatomic Molecule
A reaction involving the particles in the nucleus of an atom that can change one element into another element
Nuclear Reaction
The time it takes for half of the atoms of a radioactive element to decay
Half-life
An element found in group 17 of the periodic table
Halogen
The spontaneous emission of radiation by an unstable atomic nucleus
Radioactivity
The process of determining the age of an object using the half-life of one or more radioactive isotopes
Radioactive Dating
AN element in group 18 of the periodic table
Noble Gas
A particle is given off during radioactive decay that consist of two protons and
Alpha Particle
A Radioactive isotopes that can be followed through the steps of chemical reaction or industrial process
tracer
An element that has characteristics of both metals and nonmetals
Metalloid
A fast-moving electron that is given off as nuclear radiation
Beta Particle