Atomic Structure STBAtomic Structure MCQs (STB)#Atomic Structure#Bohr Model186Choose the best answerWhich expression represents the Bohr radius constant, a₀?Aa₀ = ε₀h²/πme²Ba₀ = n²h²/4π²m²r²Ca₀ = Ze²/4πε₀Da₀ = h/2πm Like 0 Discuss 0Share
Stoichiometry#Atomic Structure#Isotopes187Choose the best answerWho introduced the concept of isotopes?ABerzeliusBJ.J ThomsonCSoddyDAbraham Like 0 Discuss 0Share
BUMHS MDCAT 2025 Chemistry#Atomic Structure#Electronic Configuration188Choose the best answerThe electrons will enter which of these orbitals after filling the 3d orbital. (BUMHS MDCAT 2025)A4dB4fC4sD4p Like 0 Discuss 0Share
Atomic StructurePositive Rays189Choose the best answerThe nature of positive rays produced in a discharge tube mainly depends on the:AMaterial of the cathodeBNature of the residual gasCShape of the discharge tubeDApplied magnetic field only Like 0 Discuss 0Share
Atomic StructureElectronic Configuration of d-Block Elements190Choose the best answerWhich electronic configuration belongs to a Group 12 d-block element?A[Ar]³d¹⁰4s²4p⁶B[Ar]³d¹⁰4s²4p¹C[Ar]³d¹⁰4s²D[Ar]⁴s² Like 0 Discuss 0Share