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प्रश्न
Write a scientific reason.
Elements belonging to the same group have the same valency.
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उत्तर
- The valency of an element is determined by the number of valence electrons in the outermost shell of an atom of an element.
- All the elements in a group have the same number of valence electrons. Therefore, elements in the same group should have the same valency.
- For example, the elements of group I contain only one valence electron; the valency of elements of group I is one. Similarly for group II, the valency is two.
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संबंधित प्रश्न
The given table shows elements with the same number of electrons in its valence shell.
| Elements | A | B | C |
| m.p. | 63.0 | 180.0 | 97.0 |
State:
- Whether these elements belong to same group or period.
- Arrange them in order of increasing metallic character.
The electronic configuration of an element T is 2, 8, 8, 1.
What is the valency of T?
Name the element which has a total of three shells with five electrons in its valence shell?
Name the element which has a total of four shells with two electrons in its valence shell?
Name the element of period 3 with valency 4.
Explain why the following statement is not correct:
Atoms of elements in the same group have the same number of electron(s).
The metals of Group 2 from top to bottom are Be, Mg, Ca, Sr and Ba. State the common feature in the electronic configuration.
On moving down a group, the number of valence electrons ______. (remains the same/increases/decreases).
How does number of valence electrons vary on moving from left to right in the third period of a periodic table?
The valence shell of element A contains 3 electrons while the valence shell of element B contains 6 electrons. If A combines with B, the probable chemical formula of the compound is ______
Which one of the following elements exhibits a maximum number of valence electrons?
Elements of group 1 and elements of group 17 both have valency 1. Explain.
Correct the statement.
Elements in the same period have the same valency.
An element has 2 electrons in its N shell.
What is the valency of this element?
Match the atomic number with the following:
A gaseous element with valency 2.
How does the number of valency vary on moving from left to right in the third period of the periodic table?
