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प्रश्न
Give the criteria on the basis of which elements are placed (i) in a group and (ii) in a period in the modern periodic table. The atomic number of an element is 16. According to the criteria, in which group and period it should be placed?
उत्तर
Elements that have the same number of outermost shells are put in the same period as those that have the same number of valence electrons.
The atomic of the element is 16.
The electronic configuration of the element is 2, 8, 6.
It has 6 valence electrons in the 3rd orbit. So, it is placed in third period and 16th group of the periodic public.
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संबंधित प्रश्न
Which of the following statement about the modern periodic table is correct?
(a) It has 18 horizontal rows known as periods.
(b) It has 7 vertical columns known as periods.
(c) It has 18 vertical columns known as groups.
(d) It has 7 horizontal rows known as groups.
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Answer the following question.
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Give the symbol and valency of the following element and radical.
Calcium
Three elements A, B and C have 3, 4 and 2 electrons respectively in their outermost shell. Give the group number to which they belong in the Modern Periodic Table. Also, give their valencies.
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- Identify the element X
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- Locate the position of the element in the Modern Periodic Table.
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Match the atomic number with the following:
A rare gas.
