Atomic StructureAufbau Principle and n + ℓ Rule226Choose the best answerAccording to the Aufbau principle, which subshell is filled first?A4dB5pC5sD4d and 5s simultaneously Like 0 Discuss 0Share
Stoichiometry 11#Atomic Structure#Isotopes227Choose the best answerWhy is carbon-12 used as the standard for defining atomic mass unit?ABecause carbon is the lightest element.BBecause carbon is present in all compounds.CBecause carbon-12 is radioactive.DBecause carbon-12 is a stable and common isotope with a definite mass. Like 0 Discuss 0Share
Atomic StructureAzimuthal Quantum Number228Choose the best answerThe azimuthal quantum number of the last electron of Na, Z = 11, is:A1B2C3D0 Like 0 Discuss 0Share
Atomic StructureAufbau Principle and Orbital Energy229Choose the best answerThe correct order of increasing orbital energy is:A4s < 4p < 3dB4p < 4s < 3dC4s < 3d < 4pD4p < 3d < 4s Like 0 Discuss 0Share
Atomic Structure STBAtomic Structure MCQs (STB)#Atomic Structure#Subshell Orbitals230Choose the best answerHow many orbitals are present in a d-subshell?AThreeBFiveCSevenDNine Like 0 Discuss 0Share