Atomic StructureElectronic Configuration and Valency26Choose the best answerA neutral atom has the configuration: 1s² 2s² 2p⁶ 3s¹ Its usual valency is:A−2B+2C−1D+1 Like 0 Discuss 0Share
Atomic StructureEnergy Order of Subshells27Choose the best answerIn a multi-electron atom, the general energy order of subshells within the same principal shell is:As < p < d < fBs > p > d > fCp < d < f < sDf < d < p < s Like 0 Discuss 0Share
Atomic StructureExceptional Electronic Configuration28Choose the best answerWhich is NOT the ground-state electronic configuration of the corresponding neutral atom?ACr: [Ar] 3d⁴ 4s²BMn: [Ar] 3d⁵ 4s²CFe: [Ar] 3d⁶ 4s²DCu: [Ar] 3d¹⁰ 4s¹ Like 0 Discuss 0Share
Atomic StructureFormation of Ions29Choose the best answerA positive ion is formed from a neutral atom by:AIncreasing its nuclear chargeBGaining protonsCLosing electronsDLosing protons Like 0 Discuss 0Share
Atomic StructureHund's Rule and Unpaired Electrons30Choose the best answerAccording to Hund's rule, how many unpaired electrons are present in the ground-state phosphorus atom, Z = 15?A1B2C3D5 Like 0 Discuss 0Share