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प्रश्न
How does the number of valence electrons vary on moving from left or right in the second period of the periodic table?
उत्तर
In the second period of the periodic table, the number of valence electrons increases from 1 to 8 on moving from left to right.
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संबंधित प्रश्न
Write the electronic configuration of K and Ne.
Which element has a total of three shells, with four electrons in its valence shell?
An element X belongs to group 2 and another element Y belongs to group 15 of the periodic table:
(a) What is the number of valence electron in X?
(b) What is the valency of X?
(c) What is the number of valence electrons in Y?
(d) What is the valency of Y?
Explain how you have arrived at your answers.
The atomic numbers of three elements A, B and C are given below:
| Element | Atomic number |
| A | 5 |
| B | 7 |
| C | 10 |
(i) Which element belongs to group 18?
(ii) Which element belongs to group 15?
(iii) Which element belongs to group 13?
(iv) To which period/periods do these elements belong?
An element X belong to 4th period and 17th group, state.
name of the element.
Complete the following sentences.
The properties of the elements are a periodic function of their …………… (atomic number, mass number, reative atomic mass).
Name the element which has the electronic configuration 2, 8, 3?
Taking into consideration the period of the elements given below, answer the following questions:
| Elements | Atomic Radius (pm) |
| O | 66 |
| B | 88 |
| C | 77 |
| N | 74 |
| Be | 111 |
| Li | 152 |
- Arrange the above elements in decreasing order of their atomic radii.
- State the period to which the above elements belong.
- Why this arrangement of elements is similar to the above period of modern periodic table?
- Which of the above elements have the biggest and the smallest atom?
- What is the periodic trend observed in the variation of atomic radius while going from left to right within a period?
How could the atomic radius of a noble gas be compared with the other elements in a period?
Name the period which is the shortest period of the periodic table.
