In 1871, he created the first periodic table based on the masses and properties of the known elements. Using this table, he successfully predicted the existence of new elements.
Who is Dmitri Mendeleev?
100
Defined as half the distance between two bound, identical atoms, this property increases down groups and decreases across periods (left to right).
What is the atomic radius?
100
This group (also known as group 17) contains the most reactive nonmetals on the periodic table, including fluorine, which reacts with all elements except helium and neon.
What are the halogens?
100
The d-block elements are also known by this name.
What are the transition metals?
100
This Baltimore Raven is a former University of Delaware Fightin' Blue Hen.
Who is Joe Flacco?
200
In 1911, Mosely suggested that, rather than atomic mass, the periodic table should be organized by this.
What is the atomic number (number of protons in an atom)?
200
This is the most electronegative element on the periodic table.
What is fluorine?
200
This group, also known as the alkali metals, contains the most reactive metals on the periodic table.
What is group 1.
200
This "series" in the f-block is entirely composed of radioactive metals, most of which do not have a stable isotope.
What are the actinides?
200
The star and creator of "30 Rock" who will be co-hosting the Golden Globes in January.
Who is Tina Fey?
300
Elements of this group, not predicted by Mendeleev, were first discovered well after the first version of the periodic table was published.
What are the noble gases (group 18)
300
Which has a lower electron affinity - chlorine or aluminum?
What is chlorine?
300
This group is the only one on the periodic table to contain gases, liquids, and solids at room temperature.
What is group 17?
300
Arsenic is known to replace this element in the body, giving it its toxicity.
What is phosphorus?
300
On "Lost," this sequence of numbers seemed to curse anyone unlucky enough to encounter it.
What is 4, 8, 15, 16, 23, 42?
400
This states that certain properties of elements repeat periodically when they are organized by atomic number.
What is the periodic law?
400
These two factors explain the increased ionization energy of elements on the right sign of the periodic table.
What are the octet rule and increased Z?
400
This is the most reactive alkali metal.
What is cesium?
400
Elements in this region of the periodic table become more metallic as you go down groups.
What is the p-block?
400
This city is home to the oldest George Washington monument in the United States.
What is Baltimore, MD?
500
This element, now used in fiber-optics, was predicted to exist by Mendeleev. He named it ekasilicon, and predicted an atomic mass of about 72.64 g/mol, among other properties.
What is germanium?
500
This group has the highest second ionization energy.
What are the alkali metals (Group 1)?
500
Groups 7, 12, 15, and 18 are exceptions to the electron affinity trend, in that their electron affinity values are all higher than the preceding group. What causes this?
What is a half or fully filled valence electron shell?
500
Electrons in the lanthanide series fill their f orbitals in this n-level.