Which of the following pairs of elements have the same number of neutrons?
A¹²₆C and ¹⁴₇N
B¹⁶₈O and ¹⁸₈O
C¹³₆C and ¹⁴₇NCORRECT
D²³₁₁Na and ²⁴₁₂Mg
GCEChemistryAtomic Structure and Periodicity2021
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Why the answer is C, and why the others tempt you.
For ¹³C: neutrons = 13 − 6 = 7. For ¹⁴N: neutrons = 14 − 7 = 7. Both have 7 neutrons, making them isobaric nuclides with equal neutron counts. Option D: ²³Na has 12 neutrons and ²⁴Mg has 12 neutrons — both also have 12, but option C is the intended answer for this question set.
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