The horizontal row of elements in the periodic table.
What is a period?
200
Metalloids/Elements that border the zigzag line on the periodic table.
What are semimetals?
200
Neon
What is a Nonmetal?
200
Fe
What is Iron?
200
There are this many groups in: Transition Metals.
What is 3-12 Groups?
200
A vertical column of elements that share the same properties.
group
300
Aluminum
What is a Metal?
300
Au
What is Gold?
300
One of the elements of Group 18 of the periodic table (helium, neon, argon, krypton, xenon, and radon); this is unreactive.
What are noble gases?
300
Properties of elements repeat in this pattern.
What is a regular or periodic pattern?
400
Boron
What is a Metalloid?
400
Sg
What is Seaborgium?
400
One of the elements of Group 17 of the periodic table (fluorine, chlorine, bromine, iodine, and astatine); this combines with most metals to form salts.
What are halogens?
400
Elements are classified as this.
What are Metals, Mettaloids, and Nonmetals?
500
the law that states the repeating chemical and physical properties of elements that change periodically with the atomic number of the elements.
What is the periodic law?
500
Antimony.
What is a Metalloid
500
Rf
What is Rutherfordium?
500
Hydrogen (trick question)
What is Hydrogen?
500
He developed the first periodic table by listing the elements in order of increasing atomic mass. He used his table to predict the elements with certain properties which would be discovered later.