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Periodic History
Modern Periodic Table
Classification of elements
Representative groups
more Representative groups
100
First to group the known elements.
Who was Lavoisier
100
Modern table is arranged like this.
What is atomic number?
100
Are normally solid at room temperature.
What are metals?
100
Valence electron.
What is an electron in its highest energy level?
100
React violently with water.
What are the alkali metals.
200
Russian chemist who made the first table.
Who was Mendeleev?
200
Horizontal rows on the periodic table
What are periods?
200
Shiny and good energy conductors
What are metals?
200
Elements have similar properties because of this.
What is the same number of valence electrons?
200
Halogen used to purify water.
What is Chlorine.
300
Mendeleev arranged the elements this way.
What was by atomic mass?
300
Vertical columns on the periodic table
What are Groups
300
Ability to transfer energy based on temperature.
What are metalloids?
300
Increases from top to bottom in 1a
What is reactivity
300
Can excite there electrons with electricity to give off light.
What the noble gasses?
400
Named eka-aluminum by Mendeleev.
What is gallium?
400
Increases from left to right on the periodic table
What is atomic number?
400
Poor conductors of heat.
What are non-metals?
400
Most reactive non-metal.
What is Fluorine?
400
Really a noble gas but hangs with the alkali's.
What is hydrogne?
500
Provided more evidence that Mendeleev's table was legit.
What are discovery of scandium and germanium?
500
The patterns of repeating properties on the periodic table.
What is Periodic Law?
500
Across the periods from left to right this is true.
What is elements become less metallic?
500
Most reactive metal
What is Francium?
500
It is the key element in photosynthesis.
What is magnesium