History
Structure
Sections
Representative Elements
Periodic Facts
100
Mendeleev
Who developed the first periodic table of elements?
100
a period
What is a row of elements called?
100
Representative elements
What are elements in groups 1,2 and 3-18 called?
100
Noble gases
What is the name of group 18 elements?
100
Radioactive gas produced as uranium in rocks and soil decays
What is radon?
200
Moseley
Who improved Mendeleev's periodic table?
200
Group
What is a column of elements called?
200
Transition elements
What are elements in groups 3-12 called?
200
Halogens
What is the name of group 17 elements?
200
the most abundant noble gas on Earth
What is argon?
300
Atomic mass
What is the way Mendeleev organized the periodic table?
300
Gradually and predictably
What is how a period of elements change?
300
all metals
What type of elements make up the transition elements?
300
Alkali metals
What is name of group 1 elements?
300
About 20% of the atmosphere is this gas
What is oxygen?
400
Atomic number
What is the way Moseley arranged the elements of the periodic table?
400
Share similar properties
What is true of the elements of a group or family?
400
Has properties of both metals and nonmetals
What is a metalloid?
400
Alkaline Earth metals
What is group 2 elements?
400
One of the two elements used in semiconductors
What is silicon or germanium?
500
First International Chemical Congress
What is the name of the conference Mendeleev attended in 1860?
500
118
What is the number of elements in the periodic table?
500
Has luster, malleability and ductility along with being good conductors of electricity
What is a metal?
500
the most active of all the elements in combining with other elements
What is fluorine?
500
Group 13 element that is a brittle, black metalloid
What is boron?
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