Stoichiometry Stoichiometry MCQS#Atomic Structure#Isotopes31Choose the best answerWhich pair represents isotopes of the same element?A¹²C and ¹⁴NB³⁵Cl and ³⁷ClC⁴⁰Ar and ⁴⁰CaD²³Na and ²⁴Mg Like 0 Discuss 0Share
Stoichiometry 11#Atomic Structure#Isotopes32Choose the best answerWhy is carbon-12 used as the standard for defining atomic mass unit?ABecause carbon is the lightest element.BBecause carbon is present in all compounds.CBecause carbon-12 is radioactive.DBecause carbon-12 is a stable and common isotope with a definite mass. Like 0 Discuss 0Share
Stoichiometry Stoichiometry MCQS#Atomic Structure#Isotopes33Choose the best answerA sample contains 51 atoms of bromine-79 and 49 atoms of bromine-81. What does this show?ASome bromine atoms are unstableBBromine has two different nucleon numbersCBromine has two different proton numbersDBromine-81 has 2 additional electrons than bromine-79 Like 0 Discuss 0Share
Stoichiometry#Atomic Structure#Isotopes34Choose the best answerWhich statement about isotopes is correct?AThey have the same mass number but different atomic numbersBThey have the same atomic number but different mass numbersCThey have the same number of neutrons but different protonsDThey have different atomic numbers and different chemical identities Like 0 Discuss 0Share
Atomic StructureIsotopes35Choose the best answerWhich quantity is the same for all isotopes of a given element?ANumber of protonsBNumber of neutronsCTotal number of nucleonsDMass number Like 0 Discuss 0Share