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प्रश्न
How does the number of valence electrons vary on moving from left or right in the first period of the periodic table?
उत्तर
In the first period of the periodic table, the number of valence electrons increases from 1 to 2, on moving from left to right.
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संबंधित प्रश्न
Name the element which is in first group and third period.
How does the atomic size vary on going down from top to bottom in a group of the periodic table? Why does it vary this way?
An element X belong to 4th period and 17th group, state.
name of the element.
Complete the following sentences
The similarities in the properties of a group of elements are because they have the same …………………
Copy and complete the following sentence choosing the correct word or words from those given below, at the end of the sentence:
The similarities in the properties of elements belonging to a group are because they have the same ______
The elements of one short period of the periodic table are given below in order from left to right:
Li Be B C O F Ne
(a) To which period do these elements belong?
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Arrange the following as per instruction given in the bracket.
Cl, F, Br, I (increasing electron affinity)
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State the four blocks of the modern periodic table based on the electronic configuration of elements.
Match the option A and B with the statements (i) and (ii):
| A. metal | (i) The metal that forms two types of ion. |
| B. iron | (ii) An element with electronic configuration 2, 8, 8, 3. |
