Atomic Theory Flashcards
used gold foil as a target for alpha bombardment
Rutherford
Law of Definite Proportions
Proust
measured the charge to mass ratio of an electron
Thomson
- proposed that an atom was a hard indivisible sphere
Dalton
proposed the nuclear model of the atom
Rutherford
measured the charge of an electron
Millikan
was the first to identify the neutron
Chadwick
discovered X-rays
Rongen
discovered the atomic number for elements
Moseley
proposed first atomic model that accounted for the electrical nature of the atom (Plum
Pudding theory)
Thomson
determined the mass of an electron
Millikan
equal volume of gases contain the same number of particles
Avogadro
Law of Conservation of Mass
Lavoisier
is credited with the discovery of radioactivity
Becquerel
determined the charge of an electron
Millikan
Which of the following statements was not part of Dalton’s atomic theory?
Atoms can combine in small, whole-number ratios to form compounds.
True or false the the mass of a neutron is much greater than the mass of a proton.
False
True or false In any electrically neutral atom, the nucleus contains an equal number of protons and electrons.
False
The nucleus of the radioactive isotope of strontium… contains 38 protons and 57 neutrons. They have an atomic number of 38 and a mass number of 95.is this statement true or false
True
Uranium-238 is used in the diagnosis of heart problems… what correctly describes its structure?
92 protons, 146 neutrons, and 92 electrons.
An element has two isotopes, X-60 and X-62… The average atomic mass is most likely
62U> mass>61U
An atom, 15 ^29 p, somehow gains a proton… It has now become:
16 ^ 30 si
Rutherford’s Gold Foil experiment determined that:
The nucleus is positively charged.
In order, the approximate relative mass, charge, and location of the proton is
1, +1, around the nucleus.
