15 questions · 20 seconds each · Speed bonus scoring
📈
Ready to test your knowledge?
Covers the four definitions, calculating Zeff, the across-vs-down master rule, atomic and ionic radius, ionization energy and successive IEs, electron affinity, metal and halogen reactivity, and electronegativity & bond polarity
15
Questions
20s
Per question
1000
Max points
Tip: you can answer with the keys 1–4 or A–D, and press Enter to move on.
Answering faster scores more — but a wrong fast answer is still worth nothing.
Remember the master rule: explain across a period with Zeff, and down a group
with the increased number of energy levels. Several questions are designed to catch you using the one that is constant.
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Want to review before another go? Head back to the
interactive tools for the trend map, the
Zeff calculator and the comparison tool, or the
applications page for alkali metals in water
and why water is polar.