Actinide:  Elements 89-102 are called actinides. Electrons added during the Aufbau construc . . .
Actinium (Ac):  Atomic number: 89, Atomic mass: 227 g.mol -1, Electronegativity: 1.1, Density: 1 . . .
Alkali Metal:  The Group 1 elements, lithium (Li), sodium (Na), potassium (K), rubidium (Rb), c . . .
Alkaline Earth:  An oxide of an alkaline earth metal, which produces an alkaline solution in reac . . .
Alkaline Earth Metal:  The Group 2 elements, beryllium (Be), magnesium (Mg), calcium (Ca), strontium (S . . .
Aluminum (Al):  Atomic number: 13, Atomic mass: 26.98154 g.mol -1, Electronegativity: 1.5, Densi . . .
Americium (Am):  Atomic number: 95, Atomic mass: (243) g.mol -1, Electronegativity: unknown, Dens . . .
Amphoteric:  A substance that can act as either an acid or a base in a reaction. For example, . . .
Antimony (Sb):  Atomic number: 51, Atomic mass: 121.75 g.mol -1, Electronegativity: 1.9, Density . . .
Argon (Ar):  Atomic number: 18, Atomic mass: 39.948 g.mol -1, Electronegativity: unknown, Den . . .
Arsenic (As):  Atomic number: 33, Atomic mass: 74.9216 g.mol -1, Electronegativity: 2.0, Densit . . .
Astatine (At):  Atomic number: 85, Atomic mass: (210) g.mol -1, Electronegativity: 2.2, Density: . . .
Atomic Mass:  The mass of an atom is primarily determined by the number of protons and neutron . . .
Atomic Number:  The number of protons in an atom. Each element is uniquely defined by its atomic . . .
Atomic Radius:  One half the distance between nuclei of atoms of the same element, when the atom . . .
Atomic Weight:  Atomic weight values represent weighted average of the masses of all naturally o . . .
Barium (Ba):  Atomic number: 56, Atomic mass: 137.33 g.mol -1, Electronegativity: 0.9, Density . . .
Berkelium (Bk):  Atomic number: 97, Atomic mass: (247) g.mol -1, Electronegativity: unknown, Dens . . .
Beryllium (Be):  Atomic number: 4, Atomic mass: 9.01218 g.mol -1, Electronegativity: 1.5, Density . . .
Bismuth (Bi):  Atomic number: 83, Atomic mass: 208.9804 g.mol -1, Electronegativity: 1.9, Densi . . .