Chemistry Notes Class 11 Chapter 3 Classification of Elements and Periodicity in Properties
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CLASSIFI CLASSIFI CATION CATI ON OF OF ELEMEN ELEMENTS TS AND PERIODICITY PERIODICITY IN PR OPERT OPERT IES 1.
Name th the gr group oups and period eriods s of the elements having atomic numbers a) 17 b) 33 c) 24
d) 26
Sol. In normal elements, Group number = No of valency electrons In transition elements, Group number = No of s electrons + No.of d - electrons or unpaired d - electrons Period number = Outermost orbit number. a) Atomic number = 17 Electronic configuration = 1s² 2s² 2p 6 3s² 3p5 Group number = VIIA Period number = 3 b) Atomic number = 33 Electronic configuration = 1s² 2s² 2p 6 3s² 3p6 4s² 3d10 4p³ Group number = VA Period number = 4 c) Atomic number = 24 Electronic configuration = 1s² 2s² 2p 6 3s² 3p6 4s1 3d5 Group number = VI B Period number = 4 d) Atomic number = 26 Electronic configuration - 1s² 2s² 2p 6 3s² 3p6 4s² 3d6 Group number - VIII Period number = 4. 2.
The elements elements Z = 117 117 and and 120 have have not yet been discover discovered. ed. In which which group group wou would ld you place these elements and also give the electronic configuration in each case.
Sol. Z= 117 element electronic configuration is [Rn] 4 f 14 5d10 7s² 7p5 The group of the element is VIIA group. Z = 120 element electronic configuration is [ Uuo Uuo] 8s² The group of the element is IIA group. Kesh Keshav avaa Redd Reddyy IIT IIT & Medi edicin cine Foun Founda dattion Acad Academ emyy
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Clas Classi sifi fica cati tioon of Ele Eleme ment ntss and and Perio Periodi dici city ty in in Prop Proper erti ties es
