Scientists
figured out how to take this uranium 238 and turn it into a new element, plutonium, which readily fissions,
Who is Glenn Seaborg?
Mass number - atomic number
How to calculate the number of neutrons?
only element that does not contain a neutron
What is Hydrogen?
Groups or vertical columns
What is another name for families?
family with 1 valence electron
What are the Alkali Metals?
used the Volta Pile (battery) to break up compounds into the original elements.
Who is Humphry Davy?
Rounding the atomic weight
How to calculate the mass number?
The fissionable material used in the atomic bombs dropped
What is Plutonium?
highly reactive; one dot in Lewis Dot Diagram
Period 3; 5 valence electrons
What is Phosphorus?
Concluded that the atom's center was positive and the atom must be made of "mostly empty space"
Who is Ernest Rutherford?
8 or 18
What is the number of electrons in the third shell (M shell)?
the first element heavier than uranium discovered by Seaborg
What is Neptunium?
Highly reactive; reacts often with Alkali Metals; Group 17
What are the Halogens?
6 shells; 121 neutrons
What is Mercury?
Used the x-ray spectra to eliminate fake elements and confirmed Mendeleev's Table (Cobalt and Nickel) using Families instead of Atomic Weight.
Who is Moseley?
Group 18, Period 4
What is Krypton?
Cobalt and Nickel
What are the two elements that do sit correctly on the periodic table according to atomic weight?
least reactive; last to be discovered; full shells
What are the Noble Gases?
heaviest element in its family; reacts violently to water
What is Francium?
The three scientists who discovered the three subatomic particles
Period 5; 74 neutrons
What is Iodine?
The two elements discovered by Marie Curie
What are Polonium and Radium?
two valence electrons
What are the Alkaline Earth Metals?
elements that created the universe
What are Hydrogen and Helium?