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प्रश्न
Moving down in the second group, number of valence electrons ______.
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उत्तर
Moving down in the second group, the number of valence electrons remains the same.
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संबंधित प्रश्न
What is meant by 'group' in the modern periodic table? How do the following change on moving from top to bottom in a group?
(i) Number of valence electrons
(ii) Number of occupied shells
(iii) Size of atoms
(iv) Metallic character of element
(v) Effective nuclear charge experienced by valence electrons
Write the number of horizontal rows in the modern periodic table. What are these rows called?
Which element has a total of three shells, with four electrons in its valence shell?
Which element has a total of two shells, with three 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.
How do you calculate the possible valency of an element from the electronic configuration of its atoms?
The following questions refer to the Periodic Table.
Name the first and last element in period 2.
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 |
One element of this period is missing. Which is the missing element and where should it be placed?
Formula of ion of A is A2+. Element A probably belongs to ______ group.
Moving left to right in the second period, the number of valence electrons _____.
