Atomic Structure STBAtomic Structure MCQs (STB)#Polonium and Radium#Radioactivity66Choose the best answerWhich two radioactive elements did Marie and Pierre Curie isolate from pitchblende?AUranium and thoriumBPolonium and radiumCLead and bismuthDRadium and uranium Like 0 Discuss 0Share
Atomic Structure STBAtomic Structure MCQs (STB)#Alpha Particles#Radioactivity67Choose the best answerWhat are the mass number and charge of an α particle?A1 and +1B2 and +1C4 and +2D0 and 0 Like 0 Discuss 0Share
Atomic Structure STBAtomic Structure MCQs (STB)#Atomic Structure#Electronic Configuration68Choose the best answerAccording to the n + ℓ rule, which orbital is filled first?A3dB4sCBoth are filled simultaneouslyDTheir order cannot be predicted Like 1 Discuss 0Share
Atomic Structure STBAtomic Structure MCQs (STB)#Penetrating Power#Radioactivity69Choose the best answerWhich radioactive emission has the greatest penetrating power?Aα particlesBβ particlesCγ raysDPositive rays Like 0 Discuss 0Share
Atomic Structure STBAtomic Structure MCQs (STB)#Atomic Structure#X-Rays70Choose the best answerWhich wavelength range corresponds best to X-rays?A4000–7000 ÅB0.1–10 ÅC1000–4000 ÅDGreater than 7000 Å Like 2 Discuss 0Share