Definitions
what is a substance?
matter with a composition that is always the same
What is potential energy?
stored energy
What is an alkali metal?
Group 1, 1 electron in outer level, very reactive, soft, silver, shiny, low density; Lithium, Sodium, Potassium, Rubidium, Cesium, Francium
the number of protons in the nucleus of an atom
What is group 1?
Alkali Metals
What is a compound?
A substance made up of atoms of two or more different elements joined by chemical bonds. ex: carbon dioxide
What is thermal energy?
heat energy
What are alkaline metals?
metallic elements in group 2 of the periodic table which are harder than the alkali metals and are also less reactive
What is a proton
positive charge
What is group 2
Alkaline earth metals
What is a mixture?
A combination of two or more substances that are not chemically combined, they are physically blended. ex: sand blended with water at the beach
What is kinetic energy?
energy of motion
What is a metalloid?
an element that has properties of nonmetals and metals
what is a halogen?
element in group 17
what is group 3-12?
transition elements
What is matter?
Anything that has mass and takes up space
energy of moving electrons
What is metal?
Elements that are good conductors of electric current and heat.
What is ductility?
the ability of a substance to be drawn, pulled, or extruded through a small opening to produce a wire
The Halogens
What is an element?
A pure substance made of only one kind of atom
nuclear energy?
energy stored in the nucleus of an atom
What is a semi conductor?
an element or compound that conducts electric current better than an insulator does but not as well as a conductor does
what is luster?
the way a mineral reflects light?
What is group 18?
Noble gases