PhysChemTutor's answer to Jonathan's Secondary 4 Chemistry Singapore question.

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PhysChemTutor
Physchemtutor's answer
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1st
J
J
2 years ago
From the looks of it,

X is most likely Carbon (C) or Silicon (C)
Y is most likely to be Oxygen (O) or Sulfur (S)
Z is a halogen (eg. Cl, Br I)