Chemistry 2 Flashcards
John Dalton’s Billiard Ball Model
suggested matter was all just one pure substance
J. J. Thomson’s Raisin Bun Model
He proposed that the atom contained a positively charged sphere in which negatively charged electrons were embedded
What did Hantaro Nagaoka suggest
electrons orbited a large central positive mass.
what did Ernest Rutherford introduce
The idea of a nucleus
The Bohr Model
electrons do not orbit the nucleus randomly, but rather in specific circular orbits
electrons can jump from one shell to another by gaining or losing energy. The nucleus is made from protons and neutrons
Period vs. groups on the periodic table
A period is the horizontal row numbered 1-7, the group is the vertical column numbered 1-18
What is group one on the periodic table
The Alkali metals are divided into hydrogen and the alkali metals, which are the most reactive of the elements.
What is group two on the periodic table?
The Alkaline metals. These metals also react with air and water, but are less reactive than alkali metals.
What is group 17 on the periodic table?
the halogens and are the most reactive of the non-metals
What is group 18 on the periodic table?
are the noble gases and are the most stable and unreactive of the elements.
Metals on the periodic table…
Are left of the staircase, the more reactive of the elements. They are shiny, malleable, ductile, and conduct electricity.
All are solids at room temp
Non-metals on the periodic table…
To the right of the staircase line.
Can be solids, liquids or gases at room temp.
dull, brittle and do not conduct electricity.
Define metalloids
the elements that surround the staircase, they have both metal and non-metal properties.
