The concept that most of the atom's mass is concentrated in a small nucleus surrounded by electrons was the contribution of
A) Dalton
B) Thomson
C) Rutherford
D) Chadwick
Correct Answer:
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Q47: The element with atomic number 53 is
A)Iron
B)Iridium
C)Iodine
D)Indium
Q48: What is the atomic number of sodium?
A)11
B)16
C)23
D)32
Q49: What is the atomic number of magnesium?
A)12
B)24
C)25
D)55
Q50: Which contains the largest number of neutrons?
A)C-12
B)P-31
C)Br-80
D)Sr-90
Q51: The average mass of one atom of
Q53: Models of the atom were proposed by
Q54: What is the mass number of an
Q55: Which isotope contains the same number of
Q56: Which contains the fewest neutrons?
A)H-2
B)H-3
C)He-4
D)He-5
Q57: What is the number of neutrons in
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