What is the atomic number of magnesium?
A) 12
B) 24
C) 25
D) 55
Correct Answer:
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Q44: The number of protons and neutrons in
Q45: The average mass of an atom of
Q46: A substance has 13 protons,14 neutrons,and 13
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
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
Q52: The concept that most of the atom's
Q53: Models of the atom were proposed by
Q54: What is the mass number of an
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