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प्रश्न
(a) How is possible valency of an element determined from the electronic configuration of its atom ?
(b) Determine the valency of an element X whose atomic number is 15.
उत्तर
(a) Valency can be determined from no. of electron in the outermost shell. No. of electron in the outermost shell can be observed by writing the electronic configuration.
(b) X : 2, 8, 5
15
Element X has 5 electron in the outermost shell, hence the valency of is 8–5= 3.
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संबंधित प्रश्न
State whether the following statement is true of false:
The elements in a group have consecutive atomic numbers.
The element which forms a basis oxide has the atomic number of:
(a) 18
(b) 17
(c) 14
(d) 19
The elements Li, Na and K, each having one valence electron, are in period 2, 3 and 4 respectively of modern periodic table.
(i) In which group of the periodic table should they be ?
(ii) Which one of them is least reactive ?
(iii) Which one of them has the largest atomic radius ? Give reason in justify your answer in each case.
What property forms the basis of identification?
An atom of an element has the electronic configuration 2,8,2. To which group does it belong?
What is the atomic number of elements of period 3 and group 17 of the Periodic Table?
Which of the following is a transition element?
Which one of the following does not increase while moving down the group of the periodic table?
Which of the following metals have low melting and boiling point?
How are elements grouped into various families in the periodic table?
