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100
The person who arranged the elements in groups of 3
Who is Dobereiner?
100
The number of protons in the nucleus of an atom. This identifies the element.
What is atomic number?
100
Column furthest to the right on the periodic table.
What are the Noble Gases?
100
Metals can be made into wire. They are this.
What is ductile?
100
MOST elements on the periodic table fall into this category.
What are metals?
200
Eight elements in a row made the most sense to this person.
Who is Newlands?
200
The electrons in the outer energy level. It determines the reactivity of an element.
What are valence electrons?
200
The highlighted family. 
What are the Halogens?
200
A row on the periodic table is called this.
What are periods?
200
The liquid metal.
What is mercury?
300
The Father of the Modern Periodic Table...aka...The Man
Who is mendeleev?
300
A group of 8 elements found on an early version of the periodic table...also a music term.
What is an octave?
300
What are the Alkali Metals?
300
Elements located near the stairstep line.
What are metalloids?
300
There are approximately 90 of these listed on the periodic table.
What are naturally occurring elements?
400
The person who was the first to put the elements in an 'arrangement" (really just a list).
Who is Lavoisier?
400
A group of 3 elements on an early periodic table. One little, one big, one average, but all had similar properties.
What is a triad?
400
What are Transition Metals?
400
The number of electrons MOST elements want to have in their outer level.
What is 8?
400
"Properties of the elements are functions of their atomic numbers."
What is the Periodic Law?
500
His new method of measuring atomic number changed the order of the periodic table and gave the version we have today.
Who is Moseley?
500
The unit used to measure the mass of an atom.
What is an AMU?
500
The two rows below the main part of the period table.
What are the Rare Earth Elements?
500
The Lone Wolf.
What is Hydrogen?
500
These 4 elements from Aristotle would have made for a much simpler periodic table.
What are Air, Fire, Water, Earth?