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 Multiple Choice QuestionsShort Answer Type

81.

Why do elements in the same group have similar physical and chemical properties?

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82.

In terms of period and group were would you locate the element with Z = 114?

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 Multiple Choice QuestionsLong Answer Type

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83. Distinguish between s and p-block elements.


The important points of distinctions are:

s-block elements p-block elements
1. General electronic configuration is ns1-2 1. General electronic configuration:
ns2 np-1-6 ns2 np -1-6
2. There are two groups in s-block 2. There are six groups in p-block.
3. The elements present in this block are all metals. 3. The elements present in this block are mostly non-metals.
4. They show fixed oxidation state. For example, elements in group 1 show oxidation state of + 1 while those in group 2 show oxidation state of +2. 4. Most of the members show variable oxidation states i.e. exhibit more than one oxidation state.
5. The compounds are mostly ionic in nature. 5. The compounds are mostly ionic in nature.
6. They are good reducing agents. 6. They are generally strong oxidising agents.
7. Most of the elements impart characteristic colours to the flame. 7. Most of these do not impart colours to the flame.


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84. Define transition elements. Name different transition series.
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85. Enlist the important characteristics of transition elements (or d-block elements) ?
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 Multiple Choice QuestionsShort Answer Type

86. Enlist the number of elements in each block.
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 Multiple Choice QuestionsLong Answer Type

87.

Account for the fact that the 4th period has eighteen and not eight elements.

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 Multiple Choice QuestionsShort Answer Type

88.

Lanthanoides and actinodes are placed in separate rows at the bottom of the periodic table. Explain the reason for this arrangement.

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 Multiple Choice QuestionsLong Answer Type

89.

How will you predict the position of an element in the periodic table?

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 Multiple Choice QuestionsShort Answer Type

90.

Name the block to which the elements with following valence shell electronic configurations belong:
(i) 3s2 3p5       
(ii) 3d
104s2
(iii) 3p64s2       
(iv) 6s2 4f0
(v) 4s1 3d5

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