Periodic Table of the Elements

 

Mendeleev

 

Moseley

 

Periodic Law

 

when the elements are arranged in order of increasing atomic number, there is a periodic repetition of their physical and chemical properties

 

Period

 

 

a horizontal row of elements in the periodic table

 

Group / Family

 

a vertical column of elements in the periodic table; the constituent elements of a group have similar chemical and physical properties

 

Alkali Metals

 

any metal in Group 1A of the periodic table

 

Alkaline Earth Metals

 

any metal in Group 2A of the periodic table

 

Halogen

 

a nonmetal in Group 7A of the periodic table

 

Nobel Gases

 

an element in Group 8A of the periodic table; the s and p sublevels of the highest occupied energy level are filled

 

Metals

 

one of a class of elements that are good conductors of heat and electric current; metals tend to be ductile, malleable, and shiny

 

Non-metals

 

an element that tends to be a poor conductor of heat and electric current; nonmetals generally have properties opposite to those of metals

 

Semimetals / Metalloid

 

an element that tends to have properties that are similar to those of metals and nonmetals

 

Valence Electrons

 

an electron in the highest occupied energy level of an atom

 

s, p, d, f blocks

 

 

 

atomic radius

 

one-half the distance between the nuclei of two atoms of the same element when the atoms are joined

 

ionic radius

 

 

 

ionization energy

 

the energy required to remove an electron from an atom in its gaseous state

 

Electronegativity

 

the ability of an atom to attract electrons when the atom is in a compound

 

Transition Metals

 

one of the Group B elements in which the highest occupied s sublevel and a nearby d sublevel generally contain electrons

 

Lanthanide Series

 

 

 

Actinide Series

 

 

 

Diatomic Elements

(Molecule)

 

a molecule consisting of two atoms

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