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ICSE Chemistry Class X Important Papers By M. P. Keshari

Chemistry - Periodic Properties and Variation in Properties (Solved)

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Question .1. State the number of elements in Period 1, Period 2 and Period 3 of the Periodic Table.  

    

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Question .2. Name the elements in Period 1.


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Question .3. What happens to atomic size of elements on moving from left to right in a
period?


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Question .4. What is the common feature of the electronic configuration of the elements at
the end of Period 2 and Period 3?


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Question .5. If an element is in group 7 (or group 7A), is it likely to be metallic or non-        metallic in character?


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Question .6. Supply the missing word from those in brackets:

If an element has one electron in its outermost energy level, then it is likely to

be ________  (metallic/non-metallic).


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Question .7. Complete the following sentences using the correct word.

(i) The properties of the elements are a periodic function of their ___________

(atomic number, mass number, relative atomic mass).

(ii) Moving across a ___________ of the Periodic Table, the elements show

increasing ___________ character (group, period, metallic, non-metallic).

(iii) The elements at the bottom of a group would be expected to show __________

metallic character than the element at the top (less, more).

(iv) The similarities in the properties of a group of elements is because they

have  the same __________ (atomic number, electronic configuration,

number outer electrons).


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Question .8. What is meant by a Group in the Periodic Table?


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Question .9. Within a group where would you expect to find the element with:

(a) the greatest metallic character?

(b) the largest atomic size? 


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Question .10. State whether the ionization potential increases or decreases on going down a Group.


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Question .11. How many elements are there in Period 2?


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Question .12. The following table represent The first three periods of the modern periodic table. Study the table and answer the questions that follow:

IA

2A

1B

2B

3B

4B

5B

6B

7B

8

8

8

3A

4A

5A

6A

7A

0

1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2

H

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

He

3

4

 

 

 

 

 

 

 

 

 

 

5

6

7

8

9

10

Li

Be

 

 

 

 

 

 

 

 

 

 

B

C

N

O

F

Ne

11

12

 

 

 

 

 

 

 

 

 

 

13

14

15

16

17

18

Na

Mg

 

 

 

 

 

 

 

 

 

 

Al

Si

P

S

Cl

Ar

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

(i) Write the formula of the sulphate of the element with atomic number 13.

(ii) What type of bonding will be present in the oxide of the element with atomic number 1?

(iii) Which features of the atomic structure accounts for the similarities in the chemical properties of the elements in group 7A of the periodic table?

(iv) Name the elements which has the highest ionization potential.

(v) How many electrons are present in the valency shell of the element with the atomic number 18?

(vi) What is the name given to the energy released when an atom in its isolated gaseous state accepts an electron to form an anion?

(vii) What is the electronic configuration of the element in the third period which gains one electron to change into an anion?

(viii) Fill in the blanks :

The atomic size ________ as we move from left to right across the period, because the

__________ increases but the __________ remains the same.


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Question .13. The electro-negativities (according to Pauling) of the elements in period 3 of the Periodic Table are as follows with the elements arranged in alphabetical order:

Al

Cl

Mg

Na

P

S

Si

1.5

3.0

1.2

0.9

2.1

2.5

1.8

(i) Arrange the elements in the order in which they occur in the Periodic Table from left to right. (The group 1 element first, followed by the group 2 element and so on, up to group 7.)

(ii) Choose the word or phrase from the brackets which correctly completes each of the following statements:

(a) The element below sodium in the same group would be expected to have a ______

lower/higher) electro-negativity than sodium and the element above chlorine would be

xpected to have a _________ (lower/higher) ionization potential than chlorine.

(b) On moving from left to right in a given period, the number of shells (remains the

same/increases/decreases).

(c) On moving down a group, the number of valence electrons (remains the same/increases/decreases).


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Question .14. Parts

(i) to (v) refer to changes in the properties of elements on moving left to right across a period of the Periodic Table. For each property, choose the letter corresponding to the correct answer from the choices a, b, c and d.


(i) The non-metallic character of the elements:

(a) decreases

(b) increases 

(c) remains the same 

(d) depends on the period.


(ii) The electro-negativity:

(a) depends on the number of valence electrons

(b) decreases

(c) remains the same 

(d) increases.


(iii) The ionization potential:

(a) goes up and down

(b) decreases 

(c) increases  

(d) remains the same.


(iv) The atomic size:

(a) decreases

(b) increases

(c) remains the same

(d) sometimes increases and sometimes decreases.

(v) The electron affinity of the elements in group 1 to 7:

(a) goes up and then down 

(b) decreases and then increases

(c) increases

(d) decreases.


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Question .15. The elements of one short period of the Periodic Table are given below in order from left to right:

Li  Be  B   C   O   F   Ne

(i) To which period do these elements belong?

(ii) One element of this period is missing. Which is the missing element and where  
should it be placed?

(iii) Which one of the elements in this period shows the property of catenation?

(iv) Place the three elements fluorine, beryllium and nitrogen in the order of
increasing electro-negativity.

(v) Which one of the above elements belongs to the halogen series?


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Question .16. A group of elements in the Periodic Table are given below (Boron is the first  
 member of the group and Thallium is the last):

Boron, Aluminium, Gallium, Indium, Thallium.

Answer the following questions in relation to the above group of elements :-

(i) Which element has the most metallic character?

(ii) Which element would be expected to have the highest electro-negativity?

(iii) If the electronic configuration of Aluminium is 2, 8, 3 how many electrons

are there in the outer shell of Thallium?

(iv) The atomic number of boron is 5. Write the chemical formula of the

compound formed when Boron reacts with Chlorine.

(v) Will the elements in the group to the right of this Boron group be more

metallic or less metallic in character? Justify your answer.


Answer : Click Here

Prepared By Mr. M. P. Keshari [ For Further Enquiry 09434150289]

 

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