The Periodic Table

Introduction to the Periodic Table

6.1

I. Development of the Periodic TableA. Mendeleev’s Contribution

a. 1869 first periodic table published

b. Left gaps for undiscovered elements

c. Made predictions for unknown elements

B. Moseley’s Improvementa. Rearranged table by atomic number rather

than atomic mass

b. Made clear how many undiscovered elements there were

II. The Modern Periodic TableA. Period - row of elements in the periodic

table whose properties change gradually and predictably

B. Groups - elements that have similar physical or chemical properties

III. Sections of the Periodic TableA. Two Sections

a. Groups 1, 2, 13-18: representative elements

b. Groups 5-12: Transitional elements

B. Inner transitional elements below the main table

C. Metals, Nonmetals, and Metalloidsa. Metals - luster, good conductor, malleable,

ductile, usually solid

b. Nonmetals - poor conductors, usually gasses

c. Metalloid - shares characteristics of metals and nonmetals

D. The Element Keysa. Table contains name, atomic number,

symbol, atomic mass

b. Elements are marked with their state of matter

E. Symbols for the Elementsa. One or two letter symbols based on the

element’s name

b. Do not always match current name

c. Can be named after people or places.