Periodic Organization
The modern periodic table arranges elements according to _______________
What is the element's atomic numbers?
Who demonstrated that combustion required the presence of oxygen?
Who is Antoine Lavoisier?
Brittle solids with metallic luster
What is a metalloid?
The measure of an elements ability to attract and hold electrons when bonded to other atoms is called ______________________
Ancient Greeks thought that all matter in the universe was made of only _________ elements.
Elements in the same ___________________ on the periodic table have the same number of valence electrons
What is a column?
Who led to reorganizing the periodic table on the basis of atomic number?
Who is Henry Moseley?
Possess four to eight valence electrons
What is a nonmetal?
Which of the following has the largest atomic radius? Sodium, Argon, Cesium, or Radon?
What is Cesium?
How many valence electrons do the alkaline-earth metals have?
What is two?
Where are nonmetals found on the periodic table?
What is to the right of the heavy stair step line?
Who organized elements with similar characteristics in columns like the modern periodic table?
Highly conductive and reactive
What is a metal?
Arrange the following elements from greatest electronegativity to the least. Carbon, Nitrogen, Lithium, Fluorine.
What is Fluorine, Nitrogen, Carbon, Lithium?
Refer to a periodic table. What is the family name for the group containing chlorine?
What is Halogens?
Uranium, found below the main body of the periodic table, is best classified as a(n) ____________________
What is an inner transitional metal?
Who first recognized groups of three elements with similar properties?
Who is Johann Dobereiner?
Include almost 80% of the elements
What is a metal?
How does the atomic radius of elements change from left to right across the periodic table? Explain
The atomic radius tends to get smaller from left to right across the periodic table. Additional protons and electrons create a stronger attractive force, pulling the electrons closer to the nucleus.
How many valence electrons do most transition elements have?
What is one or two?
What can we determine about all the elements in Period 3 of the periodic table?
All of the elements in Period 3 have electrons in the first, second, and third energy levels (their valence electrons are in the third energy level)
Who developed the law of octaves through arranging elements by atomic mass?
Who is John Newlands?
Semiconductors
What is a metalloid?
From top to bottom down a column on a periodic table, what happens to the atomic radius of elements? What happens to their electronegativities? Are atomic radius and electronegativity connected? Explain.
From top to bottom down a column on a periodic table, atomic radius increases and electronegativity decreases. Atomic radius affects electronegativity since, as an atom’s radius increases, the distance of its valence electrons from it nucleus increases. Electrons that are farther from the nucleus have less pull exerted on them, resulting in a lower electronegativity
Refer to a periodic table. Would you expect Fluorine or Iodine to act more like a nonmetal. Explain.
Fluorine more so than iodine would act like a nonmetal because of its distance from the heavy stairstep line on the periodic table. Fluorine would also have a smaller atomic radius and greater electronegativity than iodine.