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प्रश्न
Write 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
Correct the statement.
Valency depends upon the number of shells in an atom.
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 |
Whether these elements belong to same group or period.
An element barium has atomic number 56. Look up its position in the periodic table and answer the following question.
What is its valency?
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?
Explain why the following statement is not correct:
Atoms of elements in the same group have the same number of electron(s).
On moving down a group, the number of valence electrons ______.
How does number of valence electrons vary on moving from left to right in the third period of a periodic table?
Sodium and aluminum have atomic numbers 11 and 13, respectively. They are separated by one element in the periodic table and have valencies 1 and 3 respectively. Chlorine and potassium are also separated by one element in the periodic table (their atomic numbers being 17 and 19, respectively) and yet both have valency 1. Explain.
An element ‘A’ belongs to the third period and group 16 of the Periodic Table. Find out the valency of A.
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.
This question refers to the elements of the Periodic Table with atomic numbers from 3 to 18. Some of the elements are shown by letters, but the letters are not the usual symbols of the elements.
| 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| A | B | C | D | E | F | G | H |
| 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 |
| I | J | K | L | M | N | O | P |
Which of these is an element with valency 4?
How does the number of valency vary on moving from left to right in the third period of the periodic table?
