Elements
This term means a "pure substance made only of one kind of atom"
Element
What are 3 propertis of metals?
a) shiny, b) bendable and c) good conductor
The rule for writing element symbols is what?
First letter is capitalized and the second letter is lowercase
what is the name of the Russian chemist that developed the Periodic Table
(Dmitri) Mendeleev
The modern table is organized by what?
Atomic number
True or False: Gold is a compound made up of two different atoms
False Gold is a element
What are 3 properties of non-metals?
Fe is the symbol for what metal used in magnets
Iron
How was the periodic table organized - based on what type of element behavior
Chemical behavior
These horizontal rows tell us the number of electron shells and are called what?
Periods
True or false: the symbol for Carbon Monoxide is
Co
False Co (little o) is cobalt
Silicon and boron belong to what catagory?
Metalloids
Na is the symbol of what element
Sodium
There were blank spaces put in the periodic table - why?
For elements not yet discovered that were predicted
These vertical columns tell you the number of valence electrons
Groups or families
Before the periodic table how were elements classified?
They weren't - it was just a long disorganized list
Which elements tend to lose electrons?
Metals
CO2 is the symbol for what compound
Carbon dioxide
What is the number that organizes the Periodic Table?
Atomic Number
Group I elements have this many valence electrons and are very reactive
Group 1
The periodic table does for chemistry the same thing the _________ system did for biology
Taxonomy
Which elements tend to gain electrons?
Non-Metals
This metal is found in sand and in something that powers a popular piece of equipment
Silicon
Chemistry changed because scientists could now do this based on the period table
Predict properties
Why are noble gases called noble?
they don't bond with others.....snotty!!