Atomic StructureValence Electrons in Ions71Choose the best answerIf NA is the Avogadro constant, how many valence electrons are present in 4.2 g N³⁻ ions?A3.2NAB1.6NAC2.4NAD1.2NA Like 0 Discuss 0Share
Atomic StructureQuantum Numbers72Choose the best answerFor an electron with n = 4 and mℓ = +2, which statement is NOT possible?Amₛ may be +½Bℓ may be 2Cℓ may be 3Dℓ may be 0 or 1 Like 0 Discuss 0Share
Atomic StructureIsobars73Choose the best answerWhich one of the following pairs represents isobars?A³₂He and ⁴₂HeB²⁴₁₂Mg and ²⁵₁₂MgC⁴⁰₁₉K and ⁴⁰₂₀CaD³⁹₁₉K and ⁴⁰₁₉K Like 0 Discuss 0Share
UHS MDCAT 2025 Chemistryuhs mdcat chemistry 2025#Atomic Structure#Electronic Configuration74Choose the best answerNumber of unpaired electrons in Boron in ground state is/are:A1B2C3D4 Like 0 Discuss 0Share
Atomic StructureRutherford's Atomic Model75Choose the best answerExperimental evidence for the existence of the atomic nucleus was obtained from:AMillikan's oil-drop experimentBAtomic emission spectroscopyCMagnetic deflection of cathode raysDScattering of α-particles by a thin metal foil Like 0 Discuss 0Share