Chapter 3 Test Prep Flashcards
What did J.J. Thomson develop?
The plumb pudding model
What did Robert Millikan develop?
The oil drop experiment
What did Ernest Rutherforddevelop?
The gold foil experiment
What did Niels Bohr develop?
The four electron shells
What is equivalent to one mole?
Avogadro’s number: (6.022x10 to the 23rd power)
How do you calculate the average atomic mass?
(% nearest,10th place)x(mass #, unrounded)
Who was Democritus?
A Greek philosopher who first used the term to describe a basic indivisible particle of matter
What are cathode ray tubes?
Gas tubes containing gases at low pressure exposed to electrical currents.
What is the atomic number of an element on the periodic table?
The whole number
What is the mass number of anelementon the periodic table?
Total number of protons and neutrons
