Atomic Structure STBAtomic Structure MCQs (STB)#Atomic Structure#Subatomic Particles221Choose the best answerApproximately what percentage of an atom’s mass is concentrated in its nucleus?A99.00%B99.94%C95.50%D90.00% Like 0 Discuss 0Share
Atomic StructureQuantum Numbers and Electronic Configuration222Choose the best answerThe fourth electron of Be, Z = 4, can have the quantum numbers:An = 1, ℓ = 0, mℓ = 0, mₛ = +½Bn = 2, ℓ = 1, mℓ = 0, mₛ = +½Cn = 2, ℓ = 0, mℓ = 0, mₛ = −½Dn = 1, ℓ = 1, mℓ = +1, mₛ = +½ Like 0 Discuss 0Share
Atomic Structure STBAtomic Structure MCQs (STB)#Atomic Structure#Quantum Numbers223Choose the best answerHow many quantum numbers are needed to completely describe an electron in an atom?ATwo quantum numbersBThree quantum numbersCFour quantum numbersDFive quantum numbers Like 1 Discuss 0Share
Stoichiometry Stoichiometry MCQS#Atomic Structure#Isotopes224Choose the best answerWhich pair represents isotopes of the same element?A¹²C and ¹⁴NB³⁵Cl and ³⁷ClC⁴⁰Ar and ⁴⁰CaD²³Na and ²⁴Mg Like 0 Discuss 0Share
Atomic StructureDiscovery of Canal Rays225Choose the best answerCanal rays, also called anode rays, were discovered by:AChadwickBJ. J. ThomsonCEugen GoldsteinDBohr Like 0 Discuss 0Share