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प्रश्न
What is the main characteristic of the last element in each period of the periodic table?
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उत्तर
The last element in each period of the periodic table is a gaseous element with its valence shell completely filled. Except for helium, which has a complete duplet configuration, all five gases have a complete octet configuration.
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संबंधित प्रश्न
What is periodicity in properties of elements with reference to the Modern Periodic Table?
What are the merits of the modern periodic table of elements?
What are the periods in a periodic table? Give two characteristics of each.
Write the number of protons, neutrons and electronic configuration of \[\ce{_19^39K, _15^31P}\]. Also state their position in periodic table.
An element E has following electronic configuration:
|
K |
L |
M |
|
2 |
8 |
6 |
(a) To which group of the periodic table does element E belong?
(b) To which period of the periodic table does element E belong?
(c) State the number of valence electrons present in element E.
(d) State the valency of the element E.
State what the group number in the Modern Periodic Table signifies. Give a reason why elements in the same group, have similar valency and similar chemical properties.
Fill in the blank:
The element lithium in the Modern Periodic Table with valency 1+ belongs to the group ______.
Which of the following statements about the Modern periodic table is correct?
How does the property vary in periods and in groups?
State the group and period, of the element having three shells with three electrons in valence shell.
