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The HHU Onboarding App supports all new employees when they start their new job, making it easier for them to familiarise themselves with the wide range of activities at the university. The app provides all the important contacts and information you need at the beginning. It allows you to quickly get in touch with central service facilities and relevant contact persons who can help you integrate into HHU quickly. The information in the app is available in both German and English.

Elements turns the periodic table into short quiz rounds you can finish in a couple of minutes — on the bus, between classes, or the night before an exam. Ten questions per round. Every answer is shown immediately, and anything you miss goes to your review list so you drill the elements you actually get wrong instead of the ones you already know. FOUR WAYS TO PRACTISE - Symbol to name: see Fe, pick Iron - Name to symbol: see Iron, pick Fe - Atomic number: which element is number 26? - Element groups: metal, halogen or noble gas? THREE DIFFICULTY RANGES Start with the first 20 elements, move up to 36, then take on all 118. THE WHOLE TABLE Tap any element to see its atomic number, period, group and category. Categories are colour coded, so the shape of the table makes sense at a glance. WORKS ANYWHERE No account, no sign-up, no internet. The app makes no network requests at all, so it works in airplane mode and in an exam room. Your best score and your missed elements stay on your device — the App Store privacy label reads "Data Not Collected" because nothing is collected. FREE AND PAID The free version covers the first 20 elements in symbol-to-name mode, plus the full table and mistake review. One payment unlocks all 118 elements and all four quiz modes. No subscription, ever. Built for students, teachers and anyone who wants the table in their head rather than on a poster.