lesson 1
the basic particle from which all elements are made; the smallest particle of an element that has the properties of that element
Atom
A region of an atom in which electrons of the same energy are likely to be found
Energy Level
The average mass of all the isotopes of an element
Atomic mass
A class of elements characterized by physical properties that include shininess, malleability, ductility, and conductivity
metal
The ease and speed with which an element combines or reacts with an element combines, or reacts with other elements and compounds
Reactivity
a tiny negatively charged particle that move around the outside of the nucleus of an atom
Electron
The number of protons in the nucleus of an atom
Atomic Number
A arrangement of the elements showing the repeating pattern of their properties
Periodic Table
The way a mineral refects light from its surface
Luster
The ability of an object to carry electric current
Electrical Conductivity
the central core of an atom which contains protons and neutrons
Nucleus
A atom with the same number of protons and a different number of neutrons from other atoms of the same element
Isotopes
A one-or-two-letter representation of an element
Chemical Symbol
A term used to describe material that can be hammered or rolled into flat sheets
Malleable
The gradual wearing away of a metal element due to a chemical reaction
Corrosion
Small;positively charged particles that are found in the nucleus of a atom
Proton
the sum of the protons and neutron in the nucleus of an atom
Mass number
A horizontal row of elements in the periodic table
Period
A term used to describe a material that can be pulled out into a long wire
Ductile
An element in group 1 of the periodic table
Alkali Metals
A small particle in the nucleus of the atom, with no electrical charge
Elements in the same vertical column of the periodic table, also called families
Group
The ability of an object to transfer
Thermal Conductivity
An element in group 2 of the periodic table
Alkaline Earth Metals