The Men
Subatomic Particles
Definitions
Experiments
The Atom Chart
100
Believed the atom to be the simplest form of matter and indivisible, but he had no scientific evidence to back up his claims.
Who was Democritus
100
This is responsible for the volume of the atom
What is the electron cloud
100
Define the term electron
What is a negatively charged subatomic particle
100
This experiment led to the discovery of electrons
What is cathode ray tube
100
This element has 20 protons
What is Calcium
200
This man discovered electrons through experiments with electrical charge.
Who was JJ Thomson
200
These are equal to protons in a neutral atom
What are electrons
200
Define the law of definite proportions
What is two samples of a given compound are made of the same elements in the same proportions by mass with no regard to sample size
200
This experiment allowed for the mass of an electron to be calculated
What is oil drop experiment
200
An atom of sodium has 11 protons and 10 electrons. This is the atom type
What is cation
300
This man discovered the positive nucleus
Who was Ernest Rutherford
300
This is a neutral particle
What is neutron
300
Define nucleus
What is dense, central region with a positive charge; houses the protons and neutrons
300
This experiment allowed for the discovery of the positive nucleus
What is gold foil experiment
300
Gold has a mass number of 199. This is the number of neutrons
What is 120
400
This man discovered neutrons
Who was James Chadwick
400
These two subatomic particles reside in nucleus of the atom
What are protons and neutrons
400
Define orbitals
What is region in an atom where there is a high probability of finding electrons
400
This is what an electron needs to do to go between different energy levels
What is gain or lose energy
400
Build me the nuclear symbol for an atom of Chromium that has 18 electrons
What is 52 +6 Cr 24
500
This man described a model for the atom that could explain where all the parts of the atom belonged, including electrons.
Who was Niels Bohr
500
This subatomic particle gives an element its identity.
What is proton
500
Define isotope
What is an atom with the same number of protons but a different mass. (different number of neutrons)
500
Explain the gold foil experiment (you may draw a picture)
What is alpha particles were exposed to a thin sheet of gold foil. 1/8000 deflected back, while the majority scattered straight through.
500
31 -3 P For the nuclear symbol, these are the number of protons, neutrons, electrons, and atom type.
What are Protons: 15 Neutrons: 16 Electrons: 18 Atom type: anion
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