1 MARKS QUESTIONS
7. THE PERIODIC TABLE
1. What relation about elements did Dobiereiner want to establish?
(Or) What is meant by Dobernier triad and give one example?
2. How do you appreciate the role of electronic configuration of the atoms of elements in periodic classification?
3. Comment on the position of hydrogen in periodic table.
2 MARKS QUESTIONS
1. Using the periodic table, predict the formula of compound formed between and element X of group 13and another element Y of group 16.
2. An element X belongs to 3rd period and group 2 of the periodic table. State
(a) The no. of valence electrons
(b) The valence
(C) Whether it is metal or a non-metal.
3. Collect the information regarding metallic character of elements of IA group and prepare report to support the idea of metallic character increases in a group as we move from top to bottom?
4 MARKS QUESTIONS
24. Define the modern periodic Law. Discuss the construction of the long form of the periodic table.
25. Explain how the elements are classified into s, p, d and f-block elements in the periodic table and give the advantage of this kind of classification.
26. s - block and p-block elements except 18th group elements are sometimes called as “Representative elements' based on their abundant availability in the nature. Is it justified? Why?
27. Complete the following table by using the periodic table.
|
Period Number |
Filling up orbital’s (Sub-Shell) |
Maximum number of electrons filled in all the sub-shell |
Total Number of electrons in the period |
|
1 |
|
|
|
|
2 |
|
|
|
|
3 |
|
|
|
|
4 |
4s, 3d, 4P |
18 |
18 |
|
5 |
|
|
|
|
6 |
|
|
|
|
7 |
7s, 5f, 6d, 7p |
32 |
Incomplete |
28. The electronic configuration of the elements X, Y, and Z are given below?
a) X=2 b) Y=2,6 c) Z= 2, 8, 2
i). Which element belongs to second period?
ii). Which element belongs to second group?
iii). Which element belongs to 18th group?
29. What is a periodic property? How does the following change in a group and period? Explain?
i. (a) Atomic radius (b) lonization energy
(C) Electron affinity (d) Electron negativity
ii. Explain the ionization energy order in the following sets of
elements.
a. Na, Al, C b. Li, Be, B c. C, N, O
d. F, Ne, Na é. Be, Mg, Ca
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