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प्रश्न
How does number of (i) valence electrons (ii) valency; vary on moving from left to right in the second period of a periodic table?
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उत्तर
The valence electrons in the same shell (outermost shell) increase progressively by one across the period. The first element hydrogen has one valence electron and helium has two valence electrons.
On moving from left to right in a period, valency increases from 1 to 4, then falls to one and ultimately to zero in the last group.
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संबंधित प्रश्न
How were the positions of cobalt and nickel resolved in the modern periodic table?
State how the valency of elements varies in a period of the periodic table?
What is a period in a periodic table?
Name the type of elements which have two electrons in the outermost orbit.
How many periods and groups are there in the modern periodic table?
State the number of elements in Period 3 of the Periodic Table.
In the modern periodic table, the positions of 1 to 20 elements are shown here. Identify the elements A and B. Write their atomic number.
State any five features of modern periodic table.
Explain the position of hydrogen in the periodic table.
Give reason for the following:
Inert gases do not form ion.
