Discovery
Who first proposed the idea that all matter was made up of atoms?
Democritus
What are the two subatomic particles found in the nucleus of an atom?
protons and neutrons
What does the word "atomos" mean?
Uncuttable
Who said that atoms can't be created or destroyed?
Dalton
True or False - Quarks are elementary particles that make up electrons?
Double or nothing: What are 3 of the six flavours of quarks?
False - Quarks make up protons and neutrons
Flavours of quarks - up, down, strange, charm, top and bottom. Yup really!!!!
The Blueberry Muffin Model showed what suggested theory?
That negatively charged electrons are embedded in a positively charged ball.
What are the respective charges of
a neutron?
a proton?
an electron?
neutron is neutral
proton is positive
electron is negative charged
What has a larger volume, the nucleus of an atom or the area that contains the electrons of an atom?
Double or nothing - What percent of an atoms volume do the electrons occupy?
The area that contains the electrons (electron cloud) is the larges volume of an atom.
99.99%
Who discovered that the nucleus of an atom is a dense center? For double or nothing, describe the experiment that proved this theory?
Rutherford
Gold Foil Experiment- Alpha particles with a positive charge were shot at a thin sheet of gold foil. There was a detector screen surrounding the sheet that would show where alpha particles hit it. He noticed some particles were deflected and didn't go straight through the sheet.
True or False - An electron is an elementary particle?
True
How (which experiment) did JJ Thomson show that atoms are mostly negative particles?
Cathode Ray Experiment - it used magnets and charged plates to change the direction of cathode rays.
Where are the electrons of an atom found?
Double or nothing... I will tell you this question!!!
the energy shells around the nucleus
2 in the first shell
8 in the second shell
up to 18 in the third shell
True or False: The kinetic molecular theory and the atomic theory are the same thing?
False
Who proposed that protons and neutrons have the same mass?
Rutherford
What is the relative mass of an electron?
1
How did Niels Bohr prove the theory that electrons exist in certain energy levels? Double or nothing... What experiment or apparatus (tool) did he use to show this?
He proved that there were different energy levels by observing the light released by various gases.
A Line Spectrum of Gases -
True or False- The two types of particles in an atom are elementary and secondary?
False - The two types of particles in an atom are elementary and composite.
Who stated the theory that "Atoms cannot be created, destroyed, or divided by chemical changes"?
Double or nothing: Who disproved the part about atoms not being divisible by showing that an atom was made up of positively and negatively charged particles?
John Dalton
JJ Thomson
Who proposed the idea that electrons exist in energy levels?
Neils Bohr
What are two examples of composite particles?
protons
neutrons
What does the current modern atomic model suggest about electrons in atoms?
That electrons exist as clouds of electric charge.
An electron is a type of elementary particle called what?
Leptons.
True or False - The kinetic molecular theory and the atomic theory both describe the composition and behavior of matter?
False - The kinetic molecular theory and the atomic theory both explain the composition and behavior of matter.
Who rejected Democritus's idea of empty space in an atom?
Aristotle
What is the relative mass of a proton?
1836