Atomic Structure STBAtomic Structure MCQs (STB)#Atomic Structure#Electronic Configuration266Choose the best answerChoose the ground-state electronic configuration of Cl⁻ (Z = 17).A1s² 2s² 2p⁶ 3s² 3p⁵B1s² 2s² 2p⁶ 3s² 3p⁶C1s² 2s² 2p⁶D1s² 2s² 2p⁶ 3s² 3p⁴ Like 2 Discuss 0Share
Atomic Structure STBAtomic Structure MCQs (STB)#Atomic Structure#Emission Spectrum267Choose the best answerWhich source produces an emission-line spectrum?ASunlight passing through a prismBExcited sodium vapour in a discharge lampCWhite light passing through a cold gasDAn incandescent solid Like 0 Discuss 0Share
Atomic Structure STBAtomic Structure MCQs (STB)#Atomic Structure#X-rays268Choose the best answerAccording to Moseley’s law, √ν is directly proportional to which quantity?AAtomic massBZ − bCWavelengthDNumber of neutrons Like 0 Discuss 0Share
Atomic Structure STBAtomic Structure MCQs (STB)#Atomic Structure#Flame Tests269Choose the best answerWhich substance is commonly responsible for a bluish-green colour in fireworks?ABarium saltsBStrontium saltsCCopper compoundsDSodium salts Like 1 Discuss 0Share
Atomic Structure STBAtomic Structure MCQs (STB)#Atomic Structure#Bohr Model270Choose the best answerWhat does the negative sign in the electron–nucleus potential-energy expression indicate?AThe nucleus and electron repel each otherBThe electron-nucleus system is bound by attractive forcesCThe electron possesses a positive chargeDPotential energy is independent of distance Like 0 Discuss 0Share