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Which letter is never used in any element symbol?
100 - 25 = 75
Chadwick
electron
J
Rutherford
Dalton
atomic number
electron cloud
I discovered the Neutron in 1930's. Don't let my scary eyes fool you! I also learned that the mass of a neutron is almost the same as a proton.
100 - 25 = 75
Chadwick
electron
J
Rutherford
Dalton
atomic number
electron cloud
I am NEGATIVE; I exist in the cloud around the nucleus; I am so tiny my mass is not counted.
100 - 25 = 75
Chadwick
electron
J
Rutherford
Dalton
atomic number
electron cloud
I determined many characteristics of atoms. For example: all elements are made of atoms and all compounds are made of different elements. I thought an atom was just a hard round ball.
100 - 25 = 75
Chadwick
electron
J
Rutherford
Dalton
atomic number
electron cloud
My Gold Foil Experiment PROVED that positive particles existed in a NUCLEUS or center of the atom.
100 - 25 = 75
Chadwick
electron
J
Rutherford
Dalton
atomic number
electron cloud
You use ME to identify an ELEMENT. I am equal to the # of protons in the nucelus.
100 - 25 = 75
Chadwick
electron
J
Rutherford
Dalton
atomic number
electron cloud
electrons actually move around outside the nucleus in what is called the ___
100 - 25 = 75
Chadwick
electron
J
Rutherford
Dalton
atomic number
electron cloud
An element has an Atomic Mass of 100 and 25 protons. How many neutrons does it have?
100 - 25 = 75
Chadwick
electron
J
Rutherford
Dalton
atomic number
electron cloud
Check it!