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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
The position of three elements A, B and C in the Periodic Table are shown below –
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Group 16
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Group 17
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−
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−
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A
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−
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−
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B
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C
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(a) State whether A is a metal or non-metal.
(b) State whether C is more reactive or less reactive than A.
(c) Will C be larger or smaller in size than B?
(d) Which type of ion, cation or anion, will be formed by element A?
How does the chemical reactivity of alkali metals vary on going in group 1 of the periodic table?
What is the main characteristic of the last element in each period of the periodic table?
State the main aim of classifying elements. Which is the more fundamental property of elements that is used in the development of Modern Periodic Table? Name and state the law based on this fundamental property. On which side of the periodic table one can find metals, non-metals and metalloids?
Give the symbol and valency of the following element and radical.
Magnesium
Find the correlation:
Group 13 to 18 : p block : : ______ : d block
An element which is an essential constituent of all organic compounds belongs to
Noble gases are placed in the ______ group in the modern periodic table.
Spot the error:
The elements of group 13 are called the carbon family.
Define periods of modern periodic table.
