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Historic Evidence
Inside the Atom
Vocab
How many?
Electrons
100
The subatomic particle that was discovered first.
What is the electron?
100
Positive particle
What is the proton?
100
The number of protons in an atom
What is atomic number?
100
Protons in and atom of Helium?
What is 2?
100
How many electrons does an atom of carbon have?
What is 6
200
How Thomson knew the particles in the beam had a negative charge.
What is the beam bent towards the positive plate?
200
Positively-charged, dense center of an atom
What is the nucleus?
200
The smallest particle of an element that has the properties of that element.
What is an atom?
200
Protons in an atom of oxygen?
What is 8?
200
How many electrons are in the 1st level of a helium atom?
What is 2
300
What Rutherford thought most of the alpha particles would do when they hit the gold foil.
What is go straight through.
300
Negative particle
What is the electron?
300
The sum of the protons and neutrons
What is mass number
300
Neutrons in an atom of nitrogen-15?
What is 8?
300
How many electrons are in the 2nd level of a lithium atom?
What is 1
400
The last subatomic particle to be discovered.
What is the neutron?
400
Particle with no charge
What is the neutron?
400
Atoms of the same element that have different numbers of neutrons.
What is an isotope?
400
Neutrons in an atom of Neon-22
What is 12?
400
How many electron levels are in an atom of Arsenic in its ground state?
What is 4
500
The philosopher who first proposed and named the atom.
Who is Democritus?
500
Most of the volume of an atom
What is the electron cloud?
500
The weighted average of the mass numbers of all the isotopes of an element
What is atomic mass?
500
Total particles in an atom of iodine-127?
What is 180?
500
How many electrons are in the outer energy level of a chlorine atom?
What is 7