এটা কী, আর কীভাবে ব্যবহার করবে।

Yes — completely. Every element page, guide, tool, quiz and both languages are free, with no account needed. Soren Periodic Table is part of Soren Chat, a free study companion for NCTB students.

Yes. The content is organised around the NCTB Class 9–10 chemistry curriculum — the periodic table chapter in particular: element facts, electron configurations, group/period structure and the taught trends. See our NCTB chapter guide for how the site maps to the textbook.

Not yet, and we would rather say so plainly than leave it ambiguous: the site needs an internet connection the first time you open a page. Pages you have already visited may load from the browser cache, but this is not a true offline mode. A download-for-later/offline option is on our roadmap.

Signing in is completely optional. It does exactly one thing: syncs your progress (elements explored, quiz best score, quiz streak) to your Soren account, so switching phones or clearing the browser does not lose it. The full tool — every page, every language, every quiz — works without an account.

We use privacy-respecting, aggregate-only analytics (page views, language split, referral source). Nothing that identifies you personally is collected — no names, no accounts, no per-student tracking. If analytics is disabled for a deployment, nothing is collected at all.

Tap EN or বাং in the header. The switch is instant — no reload — and the address bar updates too (/bn/… pages are Bangla). Your language choice sticks while you browse, and either version of any page can be shared directly.