Chapter - 5 

Periodic Classification Of Elements 

āĻŽৌāϞ⧰ āϏāĻŽāϝ়ে āϏāĻŽāϝ়ে āĻļ্ā§°েāĻŖীāĻŦিāĻ­াāϜāύ

EXERCISES:-

āĻŦ্⧟া⧟াāĻŽ:-

1. Which of the following statements is not a correct statement about the trends when going from left to right across the periods of periodic Table.

ā§§) āĻĒā§°্āϝাāĻŦৃāϤ্āϤ āϤাāϞিāĻ•াā§° āϏāĻŽāϝ়āĻ›োā§ąাā§° āĻŽাāϜেā§°ে āĻŦাāĻ“ঁāĻĢাāϞ⧰ āĻĒā§°া āϏোঁāĻĢাāϞāϞৈ āϝোā§ąাā§° āϏāĻŽāϝ়āϤ āϧাā§°াāϏāĻŽূāĻšā§° āĻŦিāώāϝ়ে āϤāϞ⧰ āĻ•োāύāϟো āωāĻ•্āϤি āĻļুāĻĻ্āϧ āĻŦāĻ•্āϤāĻŦ্āϝ āύāĻšāϝ়।

(a) The elements become less metallic in nature.

(āĻ•) āĻŽৌāϞāĻŦোā§° āĻ•āĻŽ āϧাāϤুā§° āĻĒ্ā§°āĻ•ৃāϤিā§° āĻšৈ āĻĒā§°ে।

(b) The number of valence electrons increases.

(āĻ–) āĻ­্āϝাāϞেāύ্āϏ āχāϞেāĻ•্āϟ্ā§°āύ⧰ āϏংāĻ–্āϝা āĻŦৃāĻĻ্āϧি āĻĒাāϝ়।

(c) The atoms lose their electrons more easily.

(āĻ—) āĻĒā§°āĻŽাāĻŖুāĻŦোā§°ে āύিāϜ⧰ āχāϞেāĻ•্āϟ্ā§°āύāĻŦোā§° āĻ…āϧিāĻ• āϏāĻšāϜে āĻšেā§°ুā§ąাāχ āĻĒেāϞাāϝ়।

(d) The oxides become more acidic.

(āϘ) āĻ…āĻ•্āϏাāχāĻĄāĻŦোā§° āĻ…āϧিāĻ• āĻ…āĻŽ্āϞীāϝ় āĻšৈ āĻĒā§°ে।

Answer:-

2. Element X forms a chloride with the formula XCI,, which is a solid with a high melting point. X would most likely be in the same group of the Periodic Table as 

⧍) āĻŽৌāϞ X āϝ়ে XCI āϏূāϤ্ā§°ā§°ে āĻāϟা āĻ•্āϞ⧰াāχāĻĄ āĻ—āĻ āύ āϕ⧰ে,, āϝিāϟো āωāϚ্āϚ āĻ—āϞāύাংāĻ•āϝুāĻ•্āϤ āĻ•āĻ িāύ āĻĒāĻĻাā§°্āĻĨ। X āϏāĻŽ্āĻ­ā§ąāϤঃ āĻĒā§°্āϝাāĻŦৃāϤ্āϤ āϤাāϞিāĻ•াā§° āĻāĻ•েāϟা āĻ—োāϟāϤে āĻĨাāĻ•িāĻŦ

(a) Na (b) Mg (c) AI (d) Si

Answer:-

3. Which element has

ā§Š/ āĻ•োāύāϟো āĻŽৌāϞ⧰ āφāĻ›ে

(a) two shells, both of which are completely filled with electrons?

(āĻ•) āĻĻুāϟা āĻ–োāϞা, āϝি āĻĻুāϝ়োāϟা āϏāĻŽ্āĻĒূā§°্āĻŖ āχāϞেāĻ•্āϟ্ā§°āύেā§°ে āĻ­ā§°ি āφāĻ›ে?

(b) the electronic configuration 2, 8, 2?

(āĻ–) āχāϞেāĻ•্āϟ্ā§°āύিāĻ• āĻ•āύāĻĢিāĻ—াā§°েāϚāύ ⧍, ā§Ž, ⧍?

(c) a total of three shells, with four electrons in its valence shell?

(āĻ—) āĻŽুāĻ  āϤিāύিāϟা āĻ†ā§ąā§°āĻŖ, āχāϝ়াā§° āĻ­্āϝাāϞেāύ্āϏ āĻ†ā§ąā§°āĻŖāϤ āϚাā§°িāϟা āχāϞেāĻ•্āϟ্ā§°āύ āĻĨাāĻ•ে?

(d) a total of two shells, with three electrons in its valence shell?

(āϘ) āĻŽুāĻ  āĻĻুāϟা āĻ†ā§ąā§°āĻŖ, āχāϝ়াā§° āĻ­্āϝাāϞেāύ্āϏ āĻ†ā§ąā§°āĻŖāϤ āϤিāύিāϟা āχāϞেāĻ•্āϟ্ā§°āύ āĻĨাāĻ•ে?

 (e) twice as many electrons in its second shell as in its first shell?

(āĻ™) āχāϝ়াā§° āĻĻ্āĻŦিāϤীāϝ় āĻ†ā§ąā§°āĻŖāϤ āχāϝ়াā§° āĻĒ্ā§°āĻĨāĻŽ āĻ†ā§ąā§°āĻŖāϤāĻ•ৈ āĻĻুāĻ—ুāĻŖ āĻŦেāĻ›ি āχāϞেāĻ•্āϟ্ā§°āύ?

4. (a) What property do all elements in the same column of the Periodic Table as boron have in common?

ā§Ē) (āĻ•) āĻŦ’ā§°āĻŖā§° āϏৈāϤে āĻĒā§°্āϝাāĻŦৃāϤ্āϤ āϤাāϞিāĻ•াā§° āĻāĻ•েāϟা āϏ্āϤāĻŽ্āĻ­ā§° āϏāĻ•āϞো āĻŽৌāϞ⧰ āĻŽাāϜāϤ āĻ•ি āĻ•ি āĻŦৈāĻļিāώ্āϟ্āϝ āφāĻ›ে?

(b) What property do all elements in the same column of the Periodic Table as fluorine have in common?

(āĻ–) āĻĢ্āϞ’ā§°িāύ⧰ āϏৈāϤে āĻĒā§°্āϝাāĻŦৃāϤ্āϤ āϤাāϞিāĻ•াā§° āĻāĻ•েāϟা āϏ্āϤāĻŽ্āĻ­ā§° āϏāĻ•āϞো āĻŽৌāϞ⧰ āĻŽাāϜāϤ āĻ•ি āϧ⧰āĻŖā§° āĻŽিāϞ āφāĻ›ে?

Answer:-

5. An atom has electronic configuration 2, 8, 7.

ā§Ģ) āĻāϟা āĻĒā§°āĻŽাāĻŖুā§° āχāϞেāĻ•্āϟ্ā§°āύিāĻ• āĻŦিāύ্āϝাāϏ ⧍, ā§Ž, ā§­ āĻĨাāĻ•ে।

(a) What is the atomic number of this element?

(āĻ•) āĻāχ āĻŽৌāϞāϟোā§° āĻĒাā§°āĻŽাāĻŖā§ąিāĻ• āϏংāĻ–্āϝা āĻ•িāĻŽাāύ?

(b) To which of the following elements would it be chemically similar? (Atomic numbers are given in parentheses.)

(āĻ–) āϤāϞ⧰ āĻ•োāύāϟো āĻŽৌāϞ⧰ āϞāĻ—āϤ āχ ā§°াāϏাāϝ়āύিāĻ•āĻ­াā§ąে āĻŽিāϞ āĻš’āĻŦ? (āĻĒā§°āĻŽাāĻŖু āϏংāĻ–্āϝা āĻŦāύ্āϧāύীāϤ āĻĻিāϝ়া āĻšৈāĻ›ে।)

 N(7)   F(9) P(15) Ar(18)

Answer:-

6. The position of three elements A, B and C in the Periodic Table are shown below

ā§Ŧ) āĻĒā§°্āϝাāĻŦৃāϤ্āϤ āϤাāϞিāĻ•াāϤ āϤিāύিāϟা āĻŽৌāϞ A, B āφ⧰ু C ā§° āĻ…ā§ąāϏ্āĻĨাāύ āϤāϞāϤ āĻĻেāĻ–ুāĻ“ā§ąা āĻšৈāĻ›ে

Group 16                         Group 17

      B                                    A


                                         C


(a) State whether A is a metal or non-metal.

(āĻ•) A āĻāϟা āϧাāϤু āύে āĻ…āϧাāϤু āϏেāχāϟো āĻ•োā§ąা।

(b) State whether C is more reactive or less reactive than A.

(āĻ–) C A āϤāĻ•ৈ āĻ…āϧিāĻ• āĻĒ্ā§°āϤিāĻ•্ā§°িāϝ়াāĻļীāϞ āύে āĻ•āĻŽ āĻĒ্ā§°āϤিāĻ•্ā§°িāϝ়াāĻļীāϞ āϏেāχāϟো āĻ•োā§ąা।

(c) Will C be larger or smaller in size than B?

(āĻ—) āĻ—āϤāĻ•ৈ āφāĻ•াā§° āĻĄাāϙ⧰ āĻš’āĻŦ āύে āϏ⧰ু āĻš’āĻŦ?

(d) Which type of ion, cation or anion, will be formed by element A?

(āϘ) A āĻŽৌāϞ⧰ āĻĻ্āĻŦাā§°া āĻ•োāύāĻŦিāϧ āφāϝ়āύ, āĻ•েāϟিāϝ়āύ āĻŦা āĻāύিāϝ়āύ āĻ—āĻ āύ āĻš’āĻŦ?

7. Nitrogen (atomic number 7) and phosphorus (atomic number 15) belong to group 15 of the Periodic Table. Write the electronic configuration of these two elements. Which of these will be more electronegative? Why?

ā§­) āύাāχāϟ্ā§°’āϜেāύ (āĻĒā§°āĻŽাāĻŖু āϏংāĻ–্āϝা ā§­) āφ⧰ু āĻĢāĻ›āĻĢā§°াāĻ› (āĻĒā§°āĻŽাāĻŖু āϏংāĻ–্āϝা ā§§ā§Ģ) āĻĒā§°্āϝাāĻŦৃāϤ্āϤ āϤাāϞিāĻ•াā§° ā§§ā§Ģ āύং āĻ—োāϟ⧰ āĻ…āύ্āϤ⧰্āĻ—āϤ। āĻāχ āĻĻুāϟা āĻŽৌāϞ⧰ āχāϞেāĻ•্āϟ্ā§°āύিāĻ• āĻ•āύāĻĢিāĻ—াā§°েāϚāύ āϞিāĻ–া। āχāϝ়াā§°ে āĻ•োāύāϟো āĻŦেāĻ›ি āχāϞেāĻ•্āϟ্ā§°’āύেāĻ—েāϟিāĻ­ āĻš’āĻŦ? āĻ•ি⧟?

Answer:-

8. How does the electronic configuration of an atom relate to its position in the Modern Periodic Table?

ā§Ž) āφāϧুāύিāĻ• āĻĒā§°্āϝাāĻŦৃāϤ্āϤ āϤাāϞিāĻ•াāϤ āĻĒā§°āĻŽাāĻŖুā§° āχāϞেāĻ•্āϟ্ā§°āύিāĻ• āĻŦিāύ্āϝাāϏ⧰ āϏৈāϤে āχāϝ়াā§° āĻ…ā§ąāϏ্āĻĨাāύ⧰ āϏāĻŽ্āĻĒā§°্āĻ• āĻ•েāύেāĻ•ুā§ąা?

Answer:-

9. In the Modern Periodic Table, calcium (atomic number 20) is surrounded by elements with atomic numbers 12, 19, 21 and 38. Which of these have physical and chemical properties resembling calcium?

⧝) āφāϧুāύিāĻ• āĻĒā§°্āϝাāĻŦৃāϤ্āϤ āϤাāϞিāĻ•াāϤ āĻ•েāϞāϚিāϝ়াāĻŽ (āĻĒাā§°āĻŽাāĻŖā§ąিāĻ• āϏংāĻ–্āϝা ⧍ā§Ļ)āĻ• ⧧⧍, ⧧⧝, ⧍⧧ āφ⧰ু ā§Šā§Ž āĻĒā§°āĻŽাāĻŖু āϏংāĻ–্āϝাā§° āĻŽৌāϞ⧰ে āφāĻ—ুā§°ি āφāĻ›ে।āχāϝ়াā§°ে āĻ•োāύāϟোā§° āĻ­ৌāϤিāĻ• āφ⧰ু ā§°াāϏাāϝ়āύিāĻ• āϧ⧰্āĻŽ āĻ•েāϞāϚিāϝ়াāĻŽā§° āĻĻā§°ে?

Answer:-

10. Compare and contrast the arrangement of elements in MendelÊev's Periodic Table and the Modern Periodic Table.

ā§§ā§Ļ) āĻŽেāĻŖ্āĻĄেāϞিāĻ­ā§° āĻĒā§°্āϝাāĻŦৃāϤ্āϤ āϤাāϞিāĻ•া āφ⧰ু āφāϧুāύিāĻ• āĻĒā§°্āϝাāĻŦৃāϤ্āϤ āϤাāϞিāĻ•াāϤ āĻĨāĻ•া āĻŽৌāϞāϏāĻŽূāĻšā§° āĻŦিāύ্āϝাāϏ⧰ āϤুāϞāύা āφ⧰ু āĻŦিāĻĒā§°ীāϤāĻŽুāĻ–ীāϤা āϕ⧰া।

Answer:-


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Post ID: DABP001675