Chemistry Atom Scientists and Determining Number of Protons, Neutrons, and Electrons
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27 Terms
______________ created the first atomic theory
John Dalton
Dalton’s atom was like a….
Marble
___________ discovered the electron.
JJ Thompson
JJ Thompson’s atom was ??
PLUM PUDDING
JJ Thompson used a….
Cathode Ray
The plum pudding model includes _______ embedded in a sphere of positive charge
Electrons
____________ discovered the nucleus
Ernest Rutherford
The nuclear atom model is from??
Ernest Rutherford
The nuclear atom was discovered with what experiment?
Rutherford’s Gold Foil experiment
1 in ________ particles bounced back in the gold foil experiment
8000
What is the charge of the nucleus?
Positive
Most of an atom’s mass is?
The nucleus
What charge are electrons?
Negative
Atoms are ______
Neutral
Who had the original idea that all matter was composed of atoms?
Democritus
________ though that atoms were “uncuttable”
Democritus
The diameter of an atom is ___________ times bigger than the nucleus
100,000
Electrons
1-
Protons
1+
Neutrons
Neutral!!
Isotopes are?
Atoms w/ the same number of protons but different number of neutrons
Ion
Charged atom
To find the proton number you…
Use the atomic number
If the isotope is neutral, to find the electron number you…
Used the proton number
If an ion, to find the electron number you…
Subtract: Proton - charge
To find the mass number you….
Add: proton + neutron (this is not the atomic mass)
To find the neutron number you…
Subtract: mass - proton