History of the Periodic Table
Compiled a list of 33 known elements in the late 1700s
Who is Antoine Lavoisier?
Rows on the periodic table are called _____.
What are periods?
Group 1 elements (except hydrogen) are called _____.
What are alkali metals?
Atomic radius decreases moving which direction across a period.
What is left to right?
Ionization energy increases moving which direction across a period.
What is left to right?
Scientist who arranged elements by atomic mass and noticed properties repeated every 8 elements.
Who is John Newlands?
Columns on the periodic table are called _____.
What are groups (or families)?
Highly reactive metals found in group 2.
What are alkaline earth metals?
Atomic radius increases moving this direction up or down a group.
What is down the group?
Ionization energy decreases moving up or down a group.
What is down the group?
Law stating that chemical and physical properties repeat when elements are arranged by increasing atomic number.
What is the Periodic Law?
Element with the highest electronegativity on the periodic table.
What is fluorine?
Group 17 elements are _____.
What are halogens?
What happens to atomic size when an atom loses electrons and forms a cation?
What is it becomes smaller?
Two answers: Rule stating atoms gain, lose, or share electrons to get eight valence electrons.
Exception: stable with only _____ electrons.
What is the octet rule? AND
What are two electrons?
Scientist who left gaps in his table to predict undiscovered elements.
Who is Dmitri Mendeleev?
Elements in groups 1, 2, and 13–18 are called _____.
What are representative elements?
Group 18 elements that rarely react.
What are noble gases?
An anion (negative ion) generally becomes ____ than the neutral atom.
What is larger?
Ability of an atom to attract electrons in a chemical bond.
What is electronegativity?
Refined the table by organizing elements by atomic number instead of atomic mass.
Who is Henry Moseley?
Elements located in groups 3–12 are _____.
What are transition metals?
Elements with properties of both metals and nonmetals.
What are metalloids?
Energy needed to remove an electron from a gaseous atom.
What is ionization energy?
Electronegativity increases moving which direction across a period.
What is left to right?