Origins of PT
The original periodic table of Mendeleev was based on this
What is atomic mass?
These are good conductors
What are metals?
These are nonreactive
What are noble gases?
C
What is carbon?
The group number of A elements corresponds to these
What are the number of valence electrons?
Horizontal rows in the PT are called these
What are periods?
These are found on the right side of the PT
What are nonmetals?
These are the most reactive metals.
What are alkali metals?
He
What is helium?
The period number also gives us the number of these in an electron cloud
What are shells?
The vertical columns of the PT can be referred to by these 2 names
What are groups or families?
These gain electrons and become negatively charged
What are nonmetals?
The most reactive nonmetals
What are halogens?
Cl
What is chlorine?
This refers to the size of the atoms and increases down a group
What is atomic radius?
The current PT developed by Moseley is based on this
What is atomic number?
These can be used as semiconductors
What are metalloids?
Gold and silver are examples of this largest group
What are transition metals?
Fe
What is iron?
This was last group of elements to be discovered (1894)
What are the noble gases?
This rule states that a full electron valence shell will be stable
What is the octet rule?
These are ductile
What are metals?
Bromine, the only liquid on the PT, is in this group
What are halogens?
Ag
What is silver?
Periodic means this
What is repeating?