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Notes On Periodic Table

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Published in: Chemical
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Description of periodic table

Fatima J / Hyderabad

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Qualification: M.Sc (vbs purvanchal university - 2017)

Teaches: Basic Computer, MS Office, School Level Computer, Computer Science, Mathematics, Physics, Statistics, Science, B.Sc Tuition, B.Tech Tuition

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  1. PERIODIC TABLE 1. Elements in periodic table are arranged in increasing order of atomic numbers. 2. There are 18 columns called as groups and 7 rows called as periods. 3. The arrangement of elements in periodic table makes it easy for us to study their properties. Groups: 1. The elements in same group have similar properties. 2. Atomic radius increases from top to bottom in a group. 3. Ionisation energy and electronegativity decreases in a group from top to bottom. Periods: 1. First period is the shortest with only two elements. 2. Seventh period is incomplete. 3. Atomic radius decreases from left to right in a period. 4. Ionisation energy and electronegativity increases from left to right in a period. 5. Elements on left side of period are metals and on right side are non metals. Blocks: l. 2. 3. 4. 5. 6. 7. 8. There are four blocks in a periodic table. They are s, p, d and f. The s block elements have 2 groups. The p block elements have groups from 13 to 18. The d block consists of groups from 3 to 12. They are also called as transition elements. The f block consists of two periods below the periodic table. They are also called as inner transition elements.
  2. Dying bw-mass stats Merging neutron 11 K 19 37 L 55 87 9. Li. Be At 98 They are named as lanthinides and actinides Big fusbn Cosmi: ray fbsbn Ca sc Ti V Cr 20 21 22 23 24 42 58 588 Expbding massive — stars Explcding white dwarfs Human synthese No stabb stars 25 t 43_5 Nd 60 26 44 co 27 45 28 cu 29 A 4 Au Pm Sm Eu 30 Cd 48 el-ig 85 13 31 49 Cf 14 32 Sn " so 07 57. 89 ii58 59 Pa 90 92 Cm Am 95 P 15 AS 33 Sb 88 Fm -100 s 16 34 52 Tm 69 Md 94 F 17 Br 35 53 85- Yb No 102 Ne 10 18 Kr 38 54 88 Lu 71 Lr 103

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