ICSE Worksheet for chapter-8 Periodic Table class 9

ICSE Worksheet for chapter-8 Periodic Table class 9

Worksheet For class 9

Find ICSE Worksheet for chapter-8 Periodic Table class 9

CLASS-9

BOARD: ICSE

Chemistry Worksheet - 8

TOPIC: PERIODIC TABLE

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PERIODIC TABLE

SUMMARY –

• Early attempts to classify the elements _
  1. Dobereiner’s triads (1815).
  2. Newland’s octaves (1864).
  3. Mendeleef periodic table (1869).
     (law, properties, defects)
• Modern periodic law (Moseley) (1912).
• Salient features of the modern periodic table (groups and periods).

Variation of properties –

1. Valance electrons.
2. Valency.
3. Metallic and non-metallic character.
4. Electro negativity.

SECTION -1

1. The elements A and B have electronic configuration (2, 8, 18, 2) and (2, 6) respectively.
   1. To which periods A and B belong ?
   2. To which group A and B belong ?
2. Name two alkali metals. To which group do they belong ?
3. Give the name and symbol of the following elements which occupy each of the following position in the periodic table :
   1. Period 2, group III A.
   2. Period 2, group VI A.
   3. Period 1, group I A.
   4. Period 3, group VII A.
   5. Period 4, group zero.
   6. Period 4, group II A.
4. From the lists of elements given below, make three triads and name the family of each triad.
   Cl, Li, Ca, Br, Na, Sr, I, K and Ba
5. Name or state the following with reference to the elements of the first three periods of the periodic table.
   1. The noble gas with duplet arrangement of electrons.
   2. A metalloid in period 3.
   3. A valency of element in group 14.
   4. The noble gas having an electronic configuration 2, 8, 8.
   5. The group whose elements have zero valency.
   6. A covalent compound formed between an element in period 2 and a halogen.
   7. The non-metallic element present in period 3 of group 15 and group 16.
   8. An electrovalent compound formed between an alkaline earth metal and a halogen.
   9. The bridge elements of period 3 of group 1, 2 and 13.
   10. An alkali metal in period 3 which dissolves in water giving a strong alkali.
   11. The typical element of group 14 and 15.
   12. An alkaline earth metal in period 3.

SECTION – 2

1. Lithium, sodium and potassium were put in the same group on the basis of similar properties.
   1. What is the similarity in their properties.
   2. If atomic weight of lithium and potassium are 7 and 39 respectively, what is the atomic weight of sodium ?
2. State two reasons for rejecting the law of octaves.
3. State two merits of Mendeleev’s periodic table over previous attempts of classification of the elements.
4. Give the main features of modern periodic table.
5. What are merits and demerits of the modern periodic table ?