Infer group from valence electrons
A successive ionization-energy pattern in a school extension lab indicates \(5\) outer-shell electrons for a main-group element. Predict its main-group number in the simplified model. Use the HL diagram labels before giving the value or explanation. Enter the answer and choose the interpretation that matches the chemistry.
Worked practice: chemistry evidence and answer
Use the chemical evidence first, then enter the result and interpretation that match it.
Write a full answer
Now write the response in full, in your own words — this is what the exam asks for. The AI marks it on the same moves you built above (focus, evidence, technique, judgement) and gives feedback on reasoning, evidence, and expression.