PERIODIC TABLE & PERIODIC LAW
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22 Terms
Who developed the first widely accepted periodic table?
Dmitri Mendeleev
How did Mendeleev arrange the elements?
By increasing atomic mass
How are elements arranged in the modern periodic table?
By increasing atomic number
What is the Periodic Law?
When elements are arranged by increasing atomic number, their physical and chemical properties repeat periodically
What is the Law of Octaves?
Properties repeat every eighth element
What is a group?
A vertical column on the periodic table
What is a period?
A horizontal row on the periodic table
What are representative elements?
Group A elements
What are transition metals?
Elements with partially filled d orbitals
What are inner transition metals?
Elements with partially filled f orbitals
What are halogens?
Group 17 nonmetals
What are noble gases?
Group 18 elements
What are alkali metals?
Group 1 metals
What are alkaline earth metals?
Group 2 metals
What is a metal?
Good conductor of heat and electricity that tends to lose electrons
What is a nonmetal?
Element that tends to gain electrons and is a poor conductor
What is a metalloid?
Element with properties of both metals and nonmetals
What block contains alkali and alkaline earth metals?
s block
What block contains representative elements?
s and p blocks
What block contains transition metals?
d block
What block contains inner transition metals?
f block
What determines an element's chemical properties?
Valence electrons