Development of the Periodic Table
This scientist is known for presenting the first list of elements in 1793 and used the term "element" to describe them.
Who is Antoine Lavoisier?
These are the horizontal rows in the periodic table, where elements share the same number of electron shells.
What are periods?
These elements are typically good conductors of heat and electricity and have a metallic luster.
What are metals?
This group of elements is known for being soft and highly reactive, with one valence electron.
What are alkali metals?
This property of an atom decreases across a period due to the increased attraction of the nucleus on the electrons.
What is atomic radius?
He created the first periodic table, arranging elements by atomic mass and predicting undiscovered elements.
Who is Dmitri Mendeleev?
These vertical columns in the periodic table contain elements that have similar chemical properties due to their valence electron configuration.
What are groups or families?
These elements are brittle and poor conductors.
What are nonmetals?
This element in Group 1 has a high reactivity and is commonly used in table salt.
What is sodium (Na)?
As you move down a group, this property increases because additional electron shells are added.
What is atomic radius?
This scientist discovered that arranging elements by atomic number solved problems in Mendeleev’s table.
Who is Henry Moseley?
Henry Moseley used Mendeleev's work as a foundation for this when he arranged elements by atomic number.
What is the modern periodic table?
These elements have properties between metals and nonmetals and are often semiconductors.
What are metalloids?
This group of elements is characterized by having two valence electrons and increasing reactivity as you move down the group.
What are alkaline earth metals?
This term refers to the energy required to remove an electron from an atom.
What is ionization energy?
This scientist proposed the Law of Octaves, stating that every eighth element has similar properties.
Who is John Newlands?
These are the elements found on the right side of the periodic table.
What are nonmetals?
This is the property of an element to attract electrons in a chemical bond.
What is electronegativity?
This noble gas is the most abundant in Earth’s atmosphere and is completely inert.
What is argon?
This property generally increases across a period as the nucleus attracts electrons more strongly.
What is electronegativity?
This scientist observed element periodicity through triads, or groups of three elements with similar properties.
Who is Johann Döbereiner?
These elements are found in the middle of the periodic table and often have variable valence electrons.
What are transition metals?
Elements in this group are extremely reactive and typically form salts when combined with metals.
What are halogens?
These elements in Group 17 are highly reactive, with seven valence electrons, and include fluorine, chlorine, and iodine.
What are halogens?
This property is inversely related to atomic radius, meaning smaller atoms require more energy to remove an electron.
What is ionization energy?