A substance has 13 protons,14 neutrons,and 13 electrons.Which isotope is it?
A) Al-13
B) Al-14
C) Al-27
D) Al-40
Correct Answer:
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Q41: Which isotope has the same number of
Q42: How many electrons are in a neutral
Q43: What is the atomic number of an
Q44: The number of protons and neutrons in
Q45: The average mass of an atom of
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
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