chem unit 1 pt 8

periodic table

a systematic organization of element

1. founded by Dmitri Mendeleev (late 1860’s

2. elements are arranged in order of atomic number

3. lists atomic number, atomic symbol, and atomic mass for each element

periods

rows of the periodic table

groups

columns of the periodic table

1. elements in the same ___ have similar chemical properties

2. ___ ending with an A are called main groups

3. d block are transition elements

periodicity

when one looks at the chemical properties of elements, one notices a repearting pattern of properties and reactivity

alkali metals

1A

alkaline Earth metals

2A

Chalcogens

6A

Halogens

7A

Noble gases

8A

metals

are on the left side of the periodic table

some properties include:

1. shiny luster

2. conducting heat and electricty

3. solids (except mercury)

nonmetals

are on the right side of the periodic table (they include H)

they can be solid (like Carbon), liquid (like Bromine) or gas (like Neon) at room temperature

metalloids

elements at the step-like line (except Al, Po and At)

their properties are sometimes like metals and sometimes like nonmetals