Who discovered that cathode rays consist of a stream of negative particles,electrons?
A) Crookes
B) Thomson
C) Geiger
D) Rutherford
E) Bohr
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Q53: Which isotope of hydrogen has two neutrons?
A)hydrogen-1
B)hydrogen-2
C)hydrogen-3
D)deuterium
E)H-2
Q54: How many electrons are present in an
Q55: Microwaves,light,and X-rays are all forms of
A)electricity.
B)high energy
Q56: The total mass of the protons in
Q57: Who discovered the existence of the atomic
Q59: What kind(s)of particles can be found outside
Q60: Given that helium has an isotope 4
2
Q61: Which of the following elements is a
Q62: Electron affinity is
A)the energy required to remove
Q63: What can be said about the
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