History of the Periodic Table
He is credited with finding a repeating pattern every in 8 elements.
Who is John newlands?
This periodic trend measures the size of an atom.
What is atomic radius?
These highly reactive metals are found in Group 1 of the periodic table.
What are alkali metals?
These elements are good conductors of heat and electricity and are found on the left side of the periodic table.
What are metals?
This rule states that atoms tend to bond in a way that gives them eight electrons in their outer shell.
What is the octet rule?
How many groups exist within the modern periodic table.
What are 18 groups?
This is the energy needed to remove an electron from an atom.
What is ionization energy?
This group of nonmetals are full of valence electrons.
What are noble gases?
These elements are poor conductors and are located on the right side of the periodic table.
What are nonmetals?
These elements are stable due to having a full outer shell of electrons.
What are noble gases?
He reorganized the periodic table based on atomic number rather than atomic mass.
Who is Henry Moseley?
This term describes an atom's ability to attract electrons when bonded.
What is electronegativity?
This group of nonmetals are highly reactive.
What are halogens?
These elements have properties of both metals and nonmetals.
What are metalloids?
These are the two names for ionic radii.
What are anions and cations?
The periodic law states that elements show repeating patterns of physical and chemical properties when arranged by this characteristic.
What is atomic number?
Elements in the same group have similar properties because of this shared characteristic.
What is the same number of valence electrons?
Metals located in the middle of the periodic table with similar properties.
What are transition metals?
These electrons determine the chemical and physical properties of an element.
What are valence electrons?
As you move down Group 1, alkali metals become more reactive due to this trend.
What is decreasing ionization energy or increasing atomic radius?
The first widely accepted periodic table was published in this year.
What is 1869?
Atomic radius decreases across a period due to this increase in nuclear charge.
What is effective nuclear charge?
These highly reactive metals never exist in nature.
What are alkaline earth metals?
These materials conduct electricity only under certain conditions.
What are semiconductors?
These two groups contain the most reactive elements on the periodic table.
What are alkali metals (Group 1) and halogens (Group 17)?