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HPQ:Chemistry:Post 16:Atomic Structure:Keith Guy

Question

The following elements, identified here as X, Y, W and Z have the number of electrons, protons and neutrons as shown in the table below.  

                     Protons      Neutrons    Electrons
X                       26               30             26
Y                       26               30             23
W                      26               28             26
Z                       28               28             26

Which of these statements is true

A.   X and Y are isotopes
B.   W and Z are isotopes
C.   X and W are isotopes
D.   X and Z are isotopes

Answer

X and W

Students answering correctly understand the definition of an isotope, atoms of the same element with a different number of neutrons, and that all atoms of the same element have the same number of protons.  

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Claire Phillips (not verified)

What would you do with students that got the wrong answer?