Periodic Law Key Terms

The 14 elements with atomic numbers from 90 (thorium, Th) to 103 (lawrencium, Lr)
the 14 elements with atomic numbers from 58 (cerium, ce) to 71 (lutetium, Lu)
periodic law
The physical and chemical properties of the elements are periodic functions of their atomic numbers
periodic table
an arrangement of the elements in order of their atomic numbers so that elements with simliar properties fall in the same column, or group
alkali metals
The elements of Group 1 of the periodic table (lithium, sodium, potassium, rbuidium, cesium, and francium)
alkaline-earth metals
The elements of Group 2 of the periodic table (beryllium, magnesium, calcium, strontium, barium, and radium)
transition elements
The d-block elements are metals with typical metallic properties
main-group elements
The p-block elements together together with the s-block elements
The elements of Group 17 (fluroine, chlorine, bromine, iodine, and astatine)
atomic radius
One-half the distance between the nuclei of identical atoms that are bonded together
atom or group of bonded atoms that has a positive or negative charge
Any process that results in the formation of an ion
ionization energy, IE
The energy required to remove one electron from a neutral atom of an element
electron affinity
The energy change that occurs when an electron is acquired by a neutral atom
A positive ion
A negative ion
valence electrons
The electrons available to be lost, gained, or shared in the formation of chemical compounds
a measure of the ability of an atom in a chemical compound to attract electrons
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