Periodic Table
Two physical properties of metals.
Shiny, conductors
Thomson's Model
Electrons are spread throughout atoms.
Matter
Anything that has mass and takes up space
Solid to gas
Sublimation
what are the three classifications of elements
Metals, Non metals, metalloids
Rutherford's Model
Electrons orbiting nucleus
Law of Conservation
Mass cannot be created or destroyed.
Solid to liquid
Melting
How were the elements put in order on the periodic table
By their atomic mass
Bohr's Model
Electrons are more in shells than all over the area
Atom
The smallest unit of an element that maintains the chemical properties.
Liquid to solid
Freezing
How many groups are there on a periodic table
18
Modern models
Electrons can be forced only in certain energy levels.
isotopes
An atom that has the same number of protons but different numbers of neutrons
Gas to liquid
Condensation
How many elements are there on a periodic table
118
Explain Dalton's atomic theory
All atoms of a given element are exactly alike and atoms of different elements could join to form compounds
Element
A substance that cannot be separated or broken down into simpler by chemical means.
Liquid to gas
Evaporation