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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

The elements Be, Mg and Ca each having two electrons in their outermost shells are in periods 2, 3, and 4 respectively of the modern periodic table. Answer the following questions, giving justification in each case:-

(i) Write the group to which these elements belong.

(ii) Name the least reactive element.

(iii) Name the element having largest atomic radius.

Solution

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The position of eight elements in the Modern Periodic Table is given below where atomic numbers of elements are given in the parenthesis.

Period No.

2Li(3)Be(4)
3Na(11)Mg(12)
4K(19)Ca(20)
5Rb(37)Sr(38)

(i) Write the electronic configuration of Ca.

(ii) Predict the number of valence electrons in Rb.

(iii) What is the number of shells in Sr?

(iv) Predict whether K is a metal or a non – metal.

(v) Which one of these elements has the largest atom in size?

(vi) Arrange Be, Ca, Mg and Rb in the increasing order of the size of their respective atoms.

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Which element has a total of two shells, with three electrons in its valence shell?

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Two elements ‘P’ and ‘Q’ belong to the same period of the modern periodic table and are in Group 1 and Group 2, respectively. Compare their following characteristics in tabular form:-

(a) The number of electrons in their atoms

(b) The sizes of their atoms

(c) Their metallic character

(d) Their tendencies to lose electrons

(e) The formula of their oxides

(f) The formula of their chlorides

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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

 

 

3-12

 

 

13

 

 

14

 

 

15

 

 

16

 

 

17

 

 

18

 

 

2A    B  C
3   DE   F

On the basis of the above table, answer the following questions:-

(i) Name the element which forms only covalent compounds.

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

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

(iv) Out of D and E, which is bigger in size and why?

(v) Write the common name for the family to which the elements C and F belong.

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Elements in the same group show the same valency. Give scientific reason.

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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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