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Wednesday, 16 March 2016

Periodic Classification of elements(Questions)


      Periodic Classification of elements

Q-1  X, Y and Z are the elements of a doberniers triad. If the atomic mass of X is 7 and that of z is 39, what should be the atomic mass of Y?

Q-2 A and B are the two elements having similar properties which obey Newlands law of octaves. How many elements are there in between A and B?

Q-3 Why Na is greater in atomic size than Na+

Q-4 Why does ionization energy generally decrease going down a group or family?

Q-6 An element X (2,8,2) combines separately with NO3- and (SO4)2 -, (PO4)3 – radicals .Write the formulae of the three compounds so formed. To which group of the periodic table does the element ‘X’ belong? Will it form covalent or ionic compound? Why?

Q-7 The following table shows the position of six elements A, B, C, D, E and F in the periodic table. Using the above table answer the following questions:
 (a) Which element will form only covalent compounds?
(b) Which element is a metal with valency 2?
(c) Which element is a non-metal with valency of 3?
(d) Out of D and E, which one has a bigger atomic radius and why?
(e) Write a common name for the family of elements C and F.

Q-9 Using Mendeleev’s periodic table answers the following:
 (a) Write the formula of hydride and oxide of silicon
(b) Name the elements which are in (i) II group and 4th period (ii) VI group and 3rd period. 
(c) Name the elements in group I which do not resemble with alkali metals 
(d) In group VI why does Te with atomic mass 127.60 comes before I with atomic mass 126.90 .

Q 10. A metal M forms an oxide having the formula M2O3. It belongs to 3rd period in the modern periodic table. Write the atomic number and valency of the metal.

Q-11 State the modern periodic law

Q-12 which of the two elements A=2, 8, 1 B = 2,8,8,1 i s more electropositive

Q-13 How does the atomic size vary in going from A) Left to right in a period B) Top to Bottom in a group

Q-14 An element has atomic number 13. In which group and period it should be placed? 

Q-15 How many periods and groups are there in the long from of P.T?

Q-16 Why does the size of the atoms progressively become smaller when we move from sodium (Na) to chlorine (cl) in the third period of the period table ?

Q-17 Give symbols for A. A metal of group 2. B. A metal of group 13. C. Two non metals of group 16. D. Most reactive non- metal of group 17.

Q-18 Explain  Why-
1. All the elements of a group have similar chemical properties.
2. All the elements in a period have different chemical properties.

Q-19 The atomic number of an element X is 17. Predict - A. Its valency. B. Nature of the elements. C. Whether it is metal or non – metal. D. Name of the element. E. Relative size with respect to other members of its group.

Q-20 The three elements predicted by Mendeleev from the gaps in his periodic table were known as eka- boron, eka- aluminium, eka- silicon. What names were given to these elements when they were discovered later on?

Q-21 The atomic numbers of Nitrogen, Oxygen and fluorine are 7, 8, and 9 respectively. Write the electronic configuration of each element and answer the following: 
(a) Out of N, O and F which is most electronegative and which one is least electronegative? 
(b) What is the number of valence electrons of F? 
(c) What is the valency of each of N, O and F?

Chemistry for class 10....

Periodic Classification of parts Q-1 X, Y and Z ar the weather of a doberniers triad. If the mass of X is 7and that of z is thirty-nine, what ought tobe the mass of Ysharma sir,scceducation,scc,ssc,free cbse notes,free study material,maths,mathematics,science,9718041826,? Q-2 A and B ar the 2 parts having similar properties that conform Newlands law of octaves. what number parts arthere in between A and B? Q-3 Why metal is bigger in atomic size than Na+  Q-4 Why will ionization energy usually decrease happening a gaggle or family?  Q-6 part X (2,8,2) combines one by one with NO3- and (SO4)2 -, (PO4)3 – radicals .Write the formulae of the 3compounds therefore shaped. To that cluster of the table will the part ‘X’ belong? can it kind valence or ionic compound? Why? Q-7 the subsequent table shows the position of six parts A, B, C, D, E and F within the tablemistreatment thehigher than table answer the subsequent questions:(a) that part can kind solely valence compounds? (b) that part may be a metal with valency 2? (c) that part may be a non-metal with valency of 3? (d) Out of D and E, that one contains a larger atomic radius and why? 
(e) Write a standard name for the family of parts C and F. Q-9 mistreatment Mendeleev’s table answers the following:(a) Write the formula of binary compound and compound of semiconductor (b) Name the weather that ar in (i) II cluster and fourth amount (ii) VI cluster and third amount. (c) Name the weather in cluster I that don't tally with alkali metals (d) In cluster VI why will Te with mass 127.60 comes before I with mass 126.90 .Q 10. A metal M forms AN compound having the formula M2O3. It belongs to third amount within the trendytable. Write the number and valency of the metal. Q-11 State the fashionable Mendeleev's law 
Q-12 that of the 2 parts A=2, 8, 1 B = 2,8,8,1 i s additional positive Q-13 however will the atomic size vary in going from A) Left to right in a very amount B) high to Bottom in a verycluster Q-14 part has number thirteenduring which cluster and amount it ought to be placed? Q-15 what numberperiods and teams ar there within the long from of P.T? Q-16 Why will the scale of the atoms more and more become smaller once we move from atomic number 11 (Na) to gas (cl) within the play of the amount table ? 
Q-17 provide symbols for A. A metal of cluster a pair of. B. A metal of cluster thirteen. C. 2 non metals of clustersixteen. D. Most reactive non- metal of cluster seventeen Q-18 make a case for Why- 1. All the weather of a gaggle have similar chemical properties. 
2. All the weather in a very amount have completely different chemical properties. Q-19 The number of part X is seventeen. Predict - A. Its valency. B. Nature of the weather. C. whether or not it'smetal or non – metal. D. Name of the part. E. Relative size with relation to alternative members of its clusterQ-20 The 3 parts foretold by Dmitri Ivanovich Mendeleev from the gaps in his table were called eka- element, eka- metallic element, eka- semiconductor. What names got to those parts after they were discovered later on? Q-21 The atomic numbers of gasgas and atomic number 9 ar seven, 8, and nine severally. Write the electronic configuration of every part and answer the following: (a) Out of N, O and F that is most negative and that one is least electronegative? (b) what's the amount of valence electrons of F? (c) what's the valency of every of N, O and F?
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