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Tamil Nadu Board of Secondary EducationSSLC (English Medium) Class 9

Example for liquid metal is ______.

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Question

Example for liquid metal is ______.

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Solution

Example for liquid metal is Mercury

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Chapter 12: Periodic Classification of Elements - Exercise [Page 146]

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Samacheer Kalvi Science [English] Class 9 TN Board
Chapter 12 Periodic Classification of Elements
Exercise | Q II. 4. | Page 146

RELATED QUESTIONS

Rewrite the following statement after correction, if necessary:

 Isotopes are the elements of the same group.


An element X from group 2 of the periodic table reacts with an element Y from group 17 to form a compound.

(a) What is the nature of the compound formed?
(b) State whether the compound formed will conduct electricity or not.
(c) Give the formula of the compound formed.
(d) What is the valency of element X?
(e) How many electrons are there in the outermost shell of an atom of element Y?


Atoms of eight elements A, B, C, D, E, F, G and H have the same number of electron shells but different number of electrons in their outermost shells. It was found that elements A and G combine to form an ionic compound. This ionic compound is added in a small amount to almost all vegetables and dishes during cooking. Oxides of elements A and B are basis in nature while those of elements E and F acidic. The oxide of element D is, however, almost neutral. Based on the above information, answer the following questions:

(a) To which group or period of the periodic table do these elements belong?
(b) What would be the nature of compound formed by a combination of elements B and F?
(c) Which two of these elements could definitely be metals?
(d) Which one of the eight elements is most likely to be found in gaseous state at room temperature?
(e) If the number of electrons in the outermost shell of elements C and G be 3 and 7 respectively, write formula of the compound formed by the combination of C and G.


An element X (atomic number 17) reacts with an element Y (atomic number 20) to form a compound.

(a) Write the position of these elements in the modern periodic table.

(b) Write the formula of the compound formed.

Justify your answer in each case.


Give a reason why elements need to be properly classified.


Elements belonging to the same group have the same valency.


State whether true or false. If false, correct the statement.

Metals can gain electrons.


Identify the bond between H and F in the HF molecules.


An element X of group 15 exists as diatomic molecule and combines with hydrogen at 773 K in presence of the catalyst to form a compound, ammonia which has a characteristic pungent smell.

  1. Identify the element X. How many valence electrons does it have?
  2. Draw the electron dot structure of the diatomic molecule of X. What type of bond is formed in it?
  3. Draw the electron dot structure for ammonia and what type of bond is formed in it?

Complete the following triads by inserting the missing elements.

Cl, ______, I


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