Stoichiometry 11#Atomic Structure#Isotopes341Choose 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#Atomic Structure#Isotopes342Choose the best answerHow is the relative atomic mass of an element with several isotopes calculated?AThe mass of the lightest isotope onlyBA weighted average based on isotopic abundanceCThe mass number of the most abundant isotope onlyDThe total number of neutrons Like 0 Discuss 0Share
UHS MDCAT 2023 ChemistryUHS MDCAT 2023 Past Paper#Atomic Structure#Isotopes343Choose the best answerWhich element provides the reference isotope used for the atomic-mass scale?AHBCCPDCl Like 1 Discuss 0Share
Sindh MDCAT 2021 Chemistry#Atomic Structure#Isoelectronic Species344Choose the best answerHydride ion and Helium atom have the same:ANumber of protonsBNumber of neutronsCValencyDNumber of electrons Like 0 Discuss 0Share
Stoichiometry Stoichiometry MCQS#Atomic Structure#Isotopes345Choose 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