History of Periodic Table
Periodic Trends
Element Identification
Elemental Groups
More Elemental Groups and Problem Solving

100

Name the scientist who first observed that several elements could be classified into triads?
J. W. Dobereiner

100

What is the distance from the center of an atom's nucleus to its outer most electron?
Atomic Radius

100

What element has a +2 ionic charge and 12 protons in its nucleus?
Mg, Magnesium

100

What are the names of the groups that are the most reactive groups in the s-block of the periodic table of elements?
Alkali Metals, Alkaline Earth Metals

100

What elemental group contains the elements Selenium, Oxygen, Sulfur, Tellurium, Polonium?
Oxygen Group (6A)

200

What two chemists published nearly identical schemes for classification of elements?
Dmitri Mendeleev & Lothar Meyer

200

What is the term that refers to the energy need to remove an atom's electron?
Ionization Energy

200

What element has an atomic mass of 238.
U, Uranium

200

Which group of elements play an important role in living organisms, and are also extremely valuable as strong, structural useful materials?
Transitional Metals

200

What is the name of the group that come from the Greek language and literally means salt former?
Halogen Group (7A)

300

Who developed the concept of atomic number?
H. G. J. MoseleyWho developed the concept of atomic number?

300

What is the name of the term when an atom looses its outer most electron?
Ionic Size

300

What is the name of the element with the elemental symbol Zr?
Zirconium

300

The elements boron (B), aluminum (Al), gallium (Ga), indium (In), and thallium (Ti), belong in which elemental group?
Boron Group

300

What is the name of the group that is the least reactive of all other groups and fills up all of their outermost energy levels entirely?
Noble Gases (8A)

400

Who discovered the law of octaves among the elements?
J. A. R. Newlands

400

Whatis the name of the term that refers to the energy change when an atom gains an electron?
Electron Affinity

400

Which element has 42 as its atomic number?
Mo, Molybdenum

400

Which elements belong in the Carbon Group?
Carbon (C), Silicon (Si), Germanium (G), Tin (Sn), and Lead (Pb)

400

What is the number of neutrons, proton and electrons of the element Magnesium?
Protons: 12 Electrons: 12 Neutrons: 12

500

Who is credited for the creation of the periodic table which we use today?
Dmitri Mendeleev

500

What is the name of the term that refers to the property of an element that indicates how strongly an atom of an element attracts electrons in a chemical bond?
Electronegativity

500

What element has the elemental symbol Uuu?
Unununium

500

Name the group which contains the elements: Nitrogen (N), Phosphorus (P), Arsenic (As), Antimony (Sb), and Bismuth (Bi)
Nitrogen Group (5A)

500

What is the chemical symbol for the ion with 13 protons and 10 electrons?
Al 3+