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History
Dalton's Theory and more
subatomic particles
Lots of things
fill in the blank
100
The Greek philosopher Democritus coined what word for a tiny piece of matter that cannot be divided?
What is an atom?
100
True or False Dalton stated that atoms contain subatomic particles.
What is false
100
where is the nucleus compared to the atom?
What is in the middle or in the center?
100
# of protons = # of electrons = ?
What is the atomic number?
100
John Dalton concluded that all atoms of a single ________ have the same mass.
What is element?
200
Democritus thought that matter was made up of tiny particles that (could - could not) be divided.
What is could not
200
How did Dalton describe the atom, in terms of the nucleus? Was it's mass predictable or unpredictable?
What is a tiny, solid sphere with a predictable mass for a given element.
200
subatomic particle with a negative charge
What is electron
200
How do you find the number of neutrons in an atom?
What is subtract the # of protons from the mass (atomic) number?
200
The subatomic particle that J.J. Thompson discovered was the _________ and it has a _________ charge.
What is the electron and negative?
300
J.J. Thompson's experiments provided evidence that an atom had what kind of charge?
What is negative (an electron)?
300
subatomic particle with a positive charge
What is proton?
300
If an atom has a mass of 23 what is something that is absolutely true about this atom?
What is it has an unequal number of protons and neutrons?
300
Protons and ___________ are found in the the nucleus of an atom.
What is neutrons?
400
Rutherford gave evidence of what about the nucleus of an atom?
What is it is dense and located in the middle of an atom?
400
The region in which an electron is most likely to be found is called the _______________.
What is the electron cloud?
400
subatomic particle with no charge
What is neutron?
400
What does the electron cloud represent?
What is the probability of the location of an electron?
400
If element Q has 11 protons, its atomic __________ is 11.
What is number?
500
Who provided evidence of a nucleus?
Who is Rutherford?
500
The glowing of a neon light is caused by electrons emitting energy as they? are the electrons moving to a higher or lower energy level.
What is move from a higher level to a lower level of energy?
500
What is unique for any given element?
What is atomic number or # of protons?
500
What is the difference between the ground state of an atom and the excited state of an atom?
What is the excited state has more energy and is less stable than the ground state?
500
An atom in which an electron has moved to a higher energy level is in an _____________ state.
What is excited?