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Dmitri Ivanovich Mendeleev
A Russian scientist who invented the periodic table in 1869.
Helium
Is next to hydrogen on the right and has two electrons.
Metals
Are solid at room temperature (except mercury) which is a liquid at room temperature, are all ductile, meaning they can be pulled into thin wires, lustrous or shiny, they are all good conductors of electricity and heat, malleable or can be hammered into thin sheets, and are prone to lose electrons easily.
Nonmetals
Have properties that are opposite from those in metals.
Metalloids
The elements located in the middle of the periodic table.
Horizontal Row
What is called a period?
Elements
________ can have different numbers of protons and electrons.
Periodic law
Is considered to be one of the most important concepts in chemistry.
Octet Rule
Says the elements must combine in such a way that each atom has eight electrons in its valence shell so that it has the same electronic configuration as a noble gas.
Isotopes
Atoms with the same element.
Square of the Periodic Table
Each ________ contains the same information about each element.
Valance Electrons
Decide how an atom will react in a chemical reaction.
Atomic Mass
The average mass of the atom of a specific element.
Negative Ion
A negative ion will be repelled by another ________.
Atomic Number
The number of protons that an atom contains.
Positive Ion
A positive ion will be repelled by another ________.
Elements
Unique and are made of one type of atom?
Note
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