Page 3 :
ao oer Sy arr, , , , , , , , , , , , , , , , , , , , , , Ni, Elements | Ar K Te | Th Pa Co, At. mass | 40 39 127.5 127 232 231 59 58.6, , > Modern periodic table (Modified PTT Ce ela), , ’, , ;, , ; I, , } vv, , : Atomic Mass —> Atomic Number—>, , , , Conclusion: Moseley’s 4 stert—aler metals WX electrons @ Bombardment 4 emite Ey ict X-rays spectra 1 frequency, @Y study far she ura {8 SX condition w emitted freqency #T square rootAt. number W directly related eal @ 1, , (i) It was proposed by Moseley., , (i) Modern periodic table is based on atomic number., " (iiii) Moseley did an experiment in which he bombarded high speed electron on different metal surfaces and obtained X-rays, , [Ww «Z (where v = frequency of X-rays, Z = At. no., , , , , , , , Modern Periodic Law : (Based on Atomic Number), & Moseley’s concluded that atomic number is more fundamental property than atomic mass. So he modified Mendeleef’s, , 2, periodic law and proposed modern periodic law as, “The physical and chemical properties of the elements are periodic functions of their atomic numbers.”, , Characteristics of modern periodic table :, (i) 9 vertical columns called groups., (ii) 1 to Vill group + zero group of inert gases., , (iii) Inert gases were introduced in periodic table by Ramsay., , (iv) 7 horizontal rows called periods., eM CMM utes Leos lee 1) (og, , It is also called as ‘Bohr, Bury, Rang and Werner Periodic table., , °, , itis based on the Bohr-Bury electronic configuration concept and atomic number., , ¢ This model is propeposed by Rang & Werner., , ~ This table contains 7 periods and 18 groups., , % Elements belonging to same group have same number of electrons in the outermost shell so that properties, ar., , The co-relation between the groups in long form of periodic table and in modern form of periodic table are, , , , given below., IA | IIA] IIB | IVB VB VIB VIB | VII IB 1B IA IVA VA VIA VIIA_| Zero, , 7/21/13 4 5 u 8,9, 10 }11 12 13 14 15 16 17 18, , 6, S-Blok on Bleck ———___» —__—-s¢___. b- bloc,, qe eS, , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Scanned with CamScanner

Page 5 :
;, , a, , }, , ;, , ., , “, , ea, , t, , (4) Lother Meyer, 1) Rn (2) Ra, F (4) Mg, 03, Eka-aluminium and Eka-silicon are known as :, (1) gafflum and germanium, (2) aluminium and silicon, , (3) iron and sulphur, (4) proton and silicon, , -04. According the Moseley, a straight line graph is, obtained on plotting :, (1) vvs. Z (2) vs. Z, Av vs. Z (4) IW vs. Z, , 05. According to periodic law of elements, the variation, in properties of elements is related to their :, , (1) atomic number, {2h atomic mass, , (3) nuclear mass, , (4) neutron-proton ratio, , 06. The long form of periodic table :, , (1) eight horizontal rows and eighteen vertical columns, , _ (Seven horizontal rows and eighteen vertical columns, , (3) seven horizontal rows and seven vertical columns, , 08. Which of the following s', , 09. The diagonal partner of element®¥s ‘5 \, , 44,, , 22, , (2) Ar, Al, 2, , es |, S }, A 1, ate i |), , (4) La, (3) Cr, , , , , (2) Band Al, (4) Band C, , AB and Si, , (3) Band Ga, , (4) Li (2) Al |, , 3yst (4) Mg, , hich of the following triads do not follow, , 10. Wi, Dobereiner’s law of triads ?, (1) Li, Na, K (2) Fe, Co, Ni, (4) Os, Ir, Pt, , (3) Ru, Rh, Pd, Select the incorrectly matched :, , (1) Bridge element : K, Mg, , (2) Diagonal relationship : (Li > Mg), (Be > Al), (B > Si), (3) First lanthanoid : La, , (4) Typical elements : Na, Mg, Al, S., , Select the metalloid(s)/semi-metals ?, , (4) Sn, , (2) Ge, , (3) Si, , (4) c, , , , Bee, , , , > Ultimate. Shell | Valenca| ocbe¥most chal, (n-t}2 Penultimake Shell, (n-2)2 Prepenutti abe Sheil, , , , Periodic Table, , Non-metals, , , , , , % All the non-metals and metalloids belong to, p-block (except H and He)., , | Osler OF > Metals > Novimeole> Metedloiel, , Typical or Representative CS), “The elements of second and third periods are called typical elements, , They represent the properties of their respective groups., , , , , , , , , , , , , , Groups | Hl ete vi | vu, F 2nd period Li Be | B c N oO E, t 3rd period Na | Mg | (Ab | Si P s cl, , , , , , , , , , , , , , Scanned with CamScanner