J.W. Dobereiner
a German chemist who came up with the theory of triads
Dmitri Mendeleev
The Russian chemist that developed the first widely accepted periodic table in 1869 as he created the periodic law
Periodic Law
The physical and chemical properties of the elements are periodic functions of their atomic numbers
Metals; Non-Metals; Metalloids
What are the three broad classes of elements?
IUPAC
the organization that came up with precise, internationally accepted system of naming organic compounds
Metals
- conducters of heat and electricity
- are malluable and ductile
Non-Metals
- are gases at room temperature
- exceptions include sulfur and phosphorous as they are solids.
Metalloids
Elements that have properties of both metals and nonmetals.
Blocks of the Periodic Table
Reprentive and Transitive
What are the two types of metals?
Representative Elements
Groups 1A through 7A on the periodic table are called?
Transitive Elements
What kind of element is transitive Metals and Inner transition Metals.
Transitive Metals
Group B elements usually displayed in the main body of the periodic table.
Inner Transition Metals
The elements that appear below the main body of the periodic table
Halogens
the non-metals of group 7A
Noble Gases
Group 8A
Lewis Dot Structure
diagram of a molecule using dots to represent valence electrons
Atomic Size
increases from top to bottom within a group and decreases from left to right across a period.
Atomic Radius
one-half the distance between the nuclei of two atoms of the same element when the atoms are joined
Anion
A negatively charged ion
Cation
A positively charged ion
Ionization Energy
The amount of energy required to remove an electron from an atom
ion
An atom that is charged either positively or negatively
electromagnetism
the ability of an atom of an element to attract electrons when the atom is in a compound
What kind of particles are always larger than the neutral atoms?
Negative Ions