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The Following Diagram Shows a Part of the Periodic Table Containing First Three Periods in Which Five Elements Have Been Represented by the Letters A, B, C, D and E (Which Are Not Their Chemical Symbols): 1 18 A 2 13 14 15 16 17 B C D E (I) Select the Letter Which Represents an Alkali Metal. (Ii) Select the Letter Which Represents a Nobles Gas. (Iii) Select the Letter Which Represents a Halogen. (Iv) What Type of Bond is Formed Between a and E? (V) What Type of Bond is Formed Between D and E? - Science

The following diagram shows a part of the periodic table containing first three periods in which five elements have been represented by the letters a, b, c, d and e (which are not their chemical symbols):

1             18
a 2 13 14 15 16 17  
    b         c
d           e  

(i) Select the letter which represents an alkali metal.
(ii) Select the letter which represents a nobles gas.
(iii) Select the letter which represents a halogen.
(iv) What type of bond is formed between a and e?
(v) What type  of bond is formed between d and e?

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Solution

(i) The letter 'd' represents an alkali metal. This is because group 1 elements of the periodic table, except hydrogen, are all alkali metals having 1 valence electron.

(ii) The letter 'c' represents a noble gas. All the group 18 elements are noble gases or inert gases whose valence shells are completely filled with electrons.

(iii) The letter 'e' represents a halogen. Group 17 elements are known as halogens and they have 7 valence electrons.

(iv) A covalent bond is formed between 'a' and 'e'. 'a', the top most element represents hydrogen which is the only non-metal in group 1. Therefore, when a non-metal 'a' forms a compound with another non-metal 'e', sharing of electrons takes place resulting in the formation of a covalent bond.

(v) An ionic bond is formed between 'd' and 'e'. When a metal reacts with a non-metal, a transfer of electrons takes place from the metal to the non-metal and results in the formation of an ionic bond.

  Is there an error in this question or solution?
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APPEARS IN

Lakhmir Singh Class 10 Chemistry (Science)
Chapter 5 Periodic Classification Of Elements
Q 74 | Page 308
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