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Which orbital is filled first according to increasing energy?

Which orbital is filled first according to increasing energy?

بڑھتی ہوئی توانائی کے مطابق سب سے پہلے کون سا مدار بھرا جاتا ہے؟
Explanation
  • According to the Aufbau principle, orbitals are filled in order of increasing energy levels.
  • The 5s orbital has lower energy than 5d and 6s.
  • Electrons fill the 5s orbital first before moving to higher-energy orbitals like 5d or 6s.