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Numbers
Modern Theory
100
What is the nuclear charge of a carbon atom?
+6
100
This scientist thought that atoms were the smallest particles in nature. (HINT: His theory was the cannonball theory.)
Who is John Dalton?
100
What observation led Rutherford to the conclusion that most of the atom is empty space?
Most of the alpha particles passed straight through the gold foil (they were undeflected)
100
The sum of protons and neutrons in the nucleus of an atom.
What is mass number?
100
An atom is in this when all of its electrons have the lowest possible energies.
What is a ground state?
200
Which two particles "live" in the nucleus?
Protons and neutrons
200
Was responsible for the discovery of the electron.
Who is JJ Thomson?
200
According to the Bohr model, the 3rd Energy Level can hold this many electrons?
18
200
The number of protons in an atom of a certain element.
What is atomic number?
200
This state is less stable than the ground state.
What is an excited state?
300
What is the charge and relative mass of a neutron?
CHARGE: Zero (or neutral) RELATIVE MASS: 1 amu
300
When an atom gains two electrons its charge will be...
-2
300
What is the net charge of an oxygen atom?
Zero (or neutral)
300
The atomic number of Oxygen.
What is 8?
300
Electrons move from one of these to another when atoms gain or lose energy.
What is an energy level?
400
What is the charge and relative mass of an electron?
CHARGE: -1 RELATIVE MASS: 1/1836 amu (~1/2000 amu)
400
How does an atom become a +3 cation?
By losing 3 electrons
400
How do you calculate mass number?
# of protons + # of neutrons
400
The mass number of Potassium.
What is 39.098?
400
The region of space around the nucleus where an electron is likely to be found.
What is an orbital?
500
What is the charge and relative mass of a proton?
CHARGE: +1 RELATIVE MASS: 1 amu
500
What is the name of the scientist who performed the gold foil experiment?
Ernest Rutherford
500
What do we call
What is an isotope?
500
Mass number - atomic number = ______ __ ________.
What is the numer of neutrons?
500
Scientists use this to describe how electrons move around the nucleus.
What is the electron cloud model?
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