Classification of Elements and Periodicity in Properties

Class 11 · Chemistry

83 questions36 easy31 medium16 hard

Sample Questions

Q1.Among the isoelectronic species Na⁺, Mg²⁺, and Al³⁺ (all having 10 electrons), which has the smallest radius?

AAl³⁺
BNa⁺
CMg²⁺
DAll are equal

Q2.Which of the following has the highest electronegativity?

AF (Z = 9)
BO (Z = 8)
CN (Z = 7)
DCl (Z = 17)

Q3.The first ionization enthalpy of elements generally increases across a period. Which of the following is an exception?

AIonization enthalpy of O is less than N
BIonization enthalpy of Na is less than Li
CIonization enthalpy of Cl is less than Ar
DIonization enthalpy of Be is less than B

Q4.Among O²⁻, F⁻, Na⁺, Mg²⁺, and Al³⁺ (all isoelectronic with 10 electrons), which has the largest radius?

AO²⁻
BF⁻
CNa⁺
DAl³⁺

Q5.The element with atomic number Z = 57 (Lanthanum) begins which series of the periodic table?

ALanthanoid series (4f)
BActinoid series (5f)
C3d transition series
D4d transition series

Q6.This is a sample question to preview what you'll get in the full practice test...

A. Option one
B. Option two
C. Option three
D. Option four

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Concepts Covered

4f electrons4f subshell5d vs 4d metalsDobereiner's triadsGroup 1Group 1 oxidesGroup 1 reactivityGroup 14 elementsGroup 16Group 17 trendsIUPAC nomenclatureLi-Mg similarityMendeleev's anomaliesMendeleev's periodic tableMendeleev's predictionsMg vs NaModern Periodic LawMoseley's workNewlands' Law of OctavesPauling scalePeriod 1Period 2Period 3Period 6Slater's rulesacidic and basic oxidesalkali metalsallotropyaluminium oxideamphoteric oxidesanionatomic massatomic mass vs atomic numberatomic numberatomic radiiatomic radiusatomic sizebasic characterberyllium vs boronblock classificationblocks of periodic tablebond strengthbond strength trendbrominecaesiumcarboncarbon allotropescationchemical propertieschlorinechromiumcombining capacitycore electronscovalent radiusd-block atomic radiid-block classificationd-block elementsdiagonal relationshipeffective nuclear chargeeka-elementselectron gain enthalpyelectron gain enthalpy exceptionselectronegativityelectronic configurationelectropositive characterelement 106element 112element 118exceptional configurationsexceptions to periodic trendsf-block elementsf-orbitalsfluorinefranciumgroup 1 elementsgroup 18group and period from configurationgroup identificationgroup numbergroup number from configurationgroup similaritygroup trendhalf-filled d-subshellhalf-filled stabilityhalogensheliumhistory of periodic tablehydride acidityhydrides acidic strengthinner transition elementsionic radiiionic radiusionization energy trendionization enthalpyionization enthalpy exceptionsisoelectronic seriesisoelectronic specieslanthanoid contractionlanthanoidslanthanoids and actinoidslong form periodic tablemagnesiummeasurement of atomic sizemelting pointsmetal hydroxidesmetallic charactermetallic to non-metallicmetalloidsmodern periodic lawmolybdenumnoble gasesnon-metallic characternon-metalsnuclear attractionnuclear chargenuclear charge effectnumber of elementsoganessonorbital typesoxygen vs sulfurp-block elementsperiod trendperiodic classificationperiodic tableperiodic table gapsperiodic table historyperiodic table structureperiodic trendperiodic trendsperiodic trends in oxidesperiodicityperiods and groupsperiods of periodic tablephosphorusprincipal quantum numbers-block elementsseaborgiumshell additionshieldingshielding constantshielding effectsize effectsodiumstable configurationsubshell stabilitysuccessive ionization enthalpiessulfursuperheavy elementssystematic namingtransition metalsvalencevalence electronsvalence shell configurationvan der Waals radius

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