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PERODIC TABLE------------------CRASH QUIESTIONEER SS2 2011

1)       What is Newland’s Law of octaves?

2)       Which law shows that Beryllium and Magnesium resemble each other and How?

3)       Who deserves the main credit of classifying elements?

4)       What is the fundamental property of elements and why?

5)       Which chemical property of an element was treated as one of the basic property for classifying elements and why?

6)       What is  Mendleev’s periodic Law?

7)       Though the atomic mass of cobalt (58.9) is greater than nickel (58.7) yet Co is placed before Ni in Mendleev’s periodic table. Why ? What is the limitation of Mendleev’s periodic table?

8)       Which elements did not exist at the time of Mendleev’s periodic classification? What name was given to these elements?

9)       In what way hydrogen resembles alkali metals & halogens also tell why?

10)   Why hydrogen cannot be given a fixed position in periodic table?

11)   What are isotopes? How isotopes of all the elements posed a challenge to Mendleev’s periodic table?

12)    Who proposed that atomic number is the more fundamental property for classifying elements?

13)    What is Modern periodic Law?

14)    In Modern periodic table, How do elements belonging to the same group resemble each other? Write two points.

15)    Different elements have same number of shells, in group or in period? How many elements are present in second group of the periodic table? Justify.

16)    First period of the Modern periodic table contains only two elements. Justify.

17)   “The valence electrons determine the kind and number of bonds formed by an element”. Justify.

18)    An element belongs to the first group and third period of the periodic table. What conclusion can you draw from its position ?

19)    What is atomic size? Atomic radius decreases in moving from left to right in a period. Why? Atomic radius increases down the group. Why?

20)    What is valency? Tendency to lose electrons decreases as we move from left to right in a period. Why? How would the tendency to gain electrons change as you go from left to right across a period? Tendency to lose electrons increases as we move from top to bottom in a group. Why? How would the tendency to gain electrons change as you go down a group?

21)    A metal M forms an oxide having the formula M2O3. It belongs to the third period and thirteenth group of  the Modern periodic table. Write the atomic number and valency of the element.

22)    What were the two major shortcomings of Mendleev’s periodic table? How have these been removed in the modern periodic table?

23)    Two elements X and Y have atomic numbers 12 and 16 respectively. Write the electronic configuration for these elements. To which period of the modern periodic table do these two elements belong? What type of bond will be formed between them and Why?

24)    What were the two achievements of Mendleev’s periodic table? What was the basis of classification of elements in it?

25)   In the modern periodic table a zig-zag line separates metals from non-metals. What are these elements called and why?

26)    An element X (2, 8, 2) combines separately with NO3 and SO42- and PO43-radicals. Write the formulae of the three compounds so formed. To which group of the periodic table does the element X belongs? Will it form covalent or ionic compound? Why?

27)    Atomic number is considered to be a more appropriate parameter than atomic mass for classification of elements in a periodic table. Why? How does atomic size of elements vary on moving from left to right in a period from top to bottom in a group. Give reasons for your answer.

28)    Write differences between  Mendleev’s  and Modern periodic table.

29)    An element belons to 4th period and 17th group. Find out (a) valence electron (b) valency  (c) Name of element (d) formula of this element with hydrogen

30)   Among the following element of 2nd period  --- Li, Be,B, C , N, O, F , Ne

31)   (a)Which has largest atomic size (b) smallest atomic size(c)  which has 5 valence electron(d) The most electronegative element(e) The most metallic element(f) Element with electron and form acidic oxide

32)  

 

Gr Ped

1

2

3 to 12

13

14

15

16

17

18

1

G

 

 

 

 

 

 

 

H

2

A

 

 

I

 

 

B

 

C

3

 

D

 

 

E

 

 

 

F

Answer on basis of given periodic table

(a)Which element will form only co-valent compound(b)Non metal with valency 2(c) Metal with valency2(d)Out of H, C ,F which has largest (e) Give name of family to which H, C , and F belong.

33)   Answer on basis of given periodic table

1

2

13

14

15

16

17

18

Lithium

 

 

Carbon

 

Oxygen

 

Neon

X

 

 

S

 

G

 

Q

Y

 

 

 

 

 

 

R

Z

 

 

 

 

 

 

T

(a)which is the most reactive metal(b)Which is the most reactive non metal©Name the family Q,R,T(d)Name one element of group 2,13,and 15(e)Explain why atomic no. is more important than atomic weight?(f)Give the symbol of (g)a metal from group 2(h)a metal of group 13(i)two non metal of group 16(j)most reactive non metal of group 17

34)   Atomic number is considered to be a more appropriate parameter than atomic mass for classification of elements in a periodic table. Why? How does atomic size of elements vary on moving from (a) left to right in a period (b) from top to bottom in a group.Give reasons for your answer.

35)   How could the modern Periodic table remove various anomalies of Mendleev’s Periodic table?

36)   Given below are the melting points and the atomic radil of three elements X,Y and Z of the periodic table, each having ‘n’ electrons in the outermost shell of their atoms:

Elementa

X

Y

Z

M.pts (OC)

180.5

97.5

63.4

At. Radil ()

1.23

1.57

2.02

Answer the following:

(a) Do these elements X,Y and Z, belong to the same group or to the same period?

(b) Which element will be least metallic?

37)   Given below are the melting points and the atomic radil of three elements A,B and Cof the periodic table, each having ‘n’ electrons in the outermost shell of their atoms:

Elementa

A

B

C

M.pts (OC)

214

121

101

At. Radil ()

1.20

1.31

1.36

Answer the following:

(a) Will the valencies of these elements be same or different?

(b) Which element will have the highest atomic number?

38)   Below are given some elements with their atomic radil:

Elements   :

Cs

Li

K

Rb

Na

Atomic radil  (Å) 

2.35

1.23

2.02

2.16

1.5

Infer to which of the group of periodic table they belong and how the atomic radius varies from top to bottom in a group of the perodic table and reactivity of these?

39)   The electronic configuration of an atom X is (2, 8, 7). It combines with another atom Y having one electron in the   outermost shell. (a) What type of bond will be formed between X and Y?  (b) Write the formula of the   compound formed. (c) Is it soluble in water? Why?

40)    How could the modern Periodic table remove various anomalies of Mendleev’s Periodic table?

41)   The position of three elements A,B  and C in the periodic table are shown below.     (2)

Group 16                                         Group  17

…S…….                                              A

    B                                                                   C

State whether A is a metal or non-metal

State whether C is more reactive or less reactive than A.Will C be larger or smaller

42)   An element X on burring in air form an oxide XO2 which when dissolved in water turns blue litmus red. Identify if X is a metal or non – metal. Justify your answer?

43)   The atomic numbers of the three elements X, Y& Z are 2, 6 &10 respectively.

        (i) Which two elements belong to the same group?   (ii) Which two elements belong to the same period? (iii) Valance electron & valancy of Y. 

                    Prepared by bhatiasir For 2011 term SA2 for PCC   ***      ( Good Luck & learn Basics)                                     

   

 
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