У вашего броузера проблема в совместимости с HTML5
https://unacademy.app.link/UQO9Pj9cKV
Subscribe on unacademy plus classes using my referral code 'kaushalshaillee'
Important Topics :
1. hydrogen spectrum
2. Rydberg Equation
3. Balmer Equation
4.Bohr's Model of atom
5. Dual nature
6. Heisenberg uncertainty Principle
7. quantum Numbers
8. electronic Configuration