SLE133 Lecture Notes - Lecture 2: Unified Atomic Mass Unit

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11 May 2018

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DiplomaofHealthSciences

DiplomaofScience

SLE133ChemistryinOurWorld

SLE133CHEMISTRYINOURWORLDSAMPLEQUESTIONS2018 Page4of25

Q2AtomsandthePeriodicTable[1+2+2+3+2=10marks]

a)Whatisthemaximumnumberofelectronsthatcanfitintothe5fsubshell?

 [1mark]



b)BasedontheelectronconfigurationS:1s22s22p63s23p4

i)Howmanyvalenceelectronsarethere?

 [1mark]



ii)Drawtheelectrondotsymbolforsulfur.

 [1mark]

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c)Anaturallyoccurringelementconsistsoftwoisotopes:

isotope1 68.9256u60.108%

isotope2 70.9247u39.892%

Whatistheaverageatomicmassofthisnaturallyoccurringelement

Hint:Themarksinthisquestionareallocatedforthecalculationmethod.

Notethat1unifiedatomicmassunit(u)isthesameas1atomicmassunit(amu).

 [2marks]

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