History
Who developed the law of octaves through arranged elements by atomic mass?
John Newlands
What is an element family?
A column in the periodic table, that has similar chemical and physical properties
Where on the periodic table are the nonmetals?
To the right of the stairstep line
Most of the elements are what? (metals, nonmetal, metalloids)
What family is uranium in?
Inner transition metals
Who first recognized groups of three elements had similar properties?
Johann Dobereiner
As we increase the period number, what are we gaining?
Electron energy levels
What elements are brittle solids with metal luster, and are semiconductors?
Metalloids
As we go to the left of the periodic table, what is increasing and what is decreasing?
Increasing: atomic radius
Decreasing: electronegativity
Give me an example of a metalloid.
Silicon
Germanium
Arsenic
Antimony
Tellerium
Polonium
Who started to organize the elements by atomic number?
What does the electron dot notation have?
Element abbreviation
Valence Electrons
Which is more reactive, alkili metals or alkaline-earth metals?
Alkali metals
What is electronegativity?
The measure of an element's ability to attract and hold electrons when bonded to other atoms
Metal
4 elements
Earth
Air
Fire
Water
How many valence electrons does phosphorus have?
Five
Write the electron dot notation for nitrogen.
On board
Bromine
Sodium
Chlorine
Magnesium
Magnesium
Bromine
Chlorine
What did most alchemists try to do?
Tried to turn lead into gold.
Some actually tried to find new elements
How did Antoine Lavoiser prove that fire is not an element?
Fire needs Oxygen to exist
Name the top three elements in the halogen family
Fluorine
Chorine
Bromine
Give two characteristics of metals
Dense
Ductile
Lustrous
Highly conductive
Very reactive
Why are the noble gasses not reactive?
They have eight valence electrons. They do not need to gain or lose any valence electrons to have a full energy level.