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Solution - Position of Elements and Trends in the Modern Periodic Table

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ConceptPosition of Elements and Trends in the Modern Periodic Table  

Question

Write the number of horizontal rows in the modern periodic table. What are these rows called?

Solution

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Write the electronic configuration of K and Ne.

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Consider two elements 'X' (Atomic number 17) and 'Y' (Atomic number 20)

(i) Write the positions of these elements in the modern periodic table giving justification.

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(iii) Draw the electron-dot structure of the compound formed and state the nature of the bond formed between the two elements ?

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Which element has twice as many electrons in its second shell as in its first shell?

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Study the following table in which positions of six elements A, B, C, D, E and F are shown as they are in the modern periodic table:

Group→

 

Period↓

1

 

 

2

 

 

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13

 

 

14

 

 

15

 

 

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17

 

 

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(ii) Name the element which is a metal with valency three.

(iii) Name the element which is a non-metal with valency three.

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Solution for concept: Position of Elements and Trends in the Modern Periodic Table. For the course 8th-10th CBSE
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