An __ is the smallest particle of an element.
__ was a Greek philosopher who was one of the first people to think matter was made of atoms.
Democritus called the smallest piece of matter "atomos" meaning ____
In 1802, ___ proposed the atomic theory.
couldn't be broken into smaller pieces
Dalton believed that atoms __.
Dalton believed that in any element, all the atoms are ___
Dalton believed that atoms of different elements are __
Dalton believed that atoms of two or more elements combine to form __
Dalton believed dthat atoms of each element have a unique __
Dalton believed that masses of the elements in a compound are always in a ___
A __ is a group of atoms that are joined together and act as a single unit.
__ form the basic particle of a compound.
The force that holds two atoms together is a __
Molecules can contain as many as billions of atoms, or a s few as __ atoms
One of the most simple molecules is the __ molecule
scanning tunneling microscope
The __ can magnify things so much that it can actually capture images of atoms.
inferences based on observations
Scientists studying atoms must make __ (educated guesses) about them based on ___
one of the first atomic __
iron and sulfur
Pyrite is a compound of __ and __.
Pyrite is often called "__".
Gold can be separated from a mixture of dirt and sand because of its ___.
The density of gold is much ___ than the density of most other materials.
Put the mixture of dirt, sand, and gold in a shallow pan with water. Swirl it around and then dump the water off. The dirt and sand will be washed away with the water and the more dense gold will be left in the pan.
Gold miners used a technique called panning. Describe the technique of panning.
Today, gold mining is done using machines called __.
Most elements are usually found as __.
A(n) __ is a rock that contains a metal or other useful material
To obtain an element from its compound, it is necessary to cause a __to take place.
One of the steps used to obtain __ from its ore is electrolysis.
One of the steps used to obtain copper from its ore is __.
The word electrolysis means "__".
__ are two metal strips used in electrolysis.
To remove iron from its ore, a __ is used.