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प्रश्न
An element has 2 electrons in its N shell.
State its position in periodic table.
उत्तर
Electronic configuration of the element is:
| K | L | M | N |
| 2 | 8 | 8 | 2 |
∴ Position in the periodic table is the 4th period. (Four shells).
संबंधित प्रश्न
How does the metallic character of elements in Modern Periodic Table vary on moving from left to right in a period, and (ii) down a group?Give reason to justify your answer.
Fill in the following blank with suitable word:
Group 17 elements are known as ...............
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.
Name two elements in each case:
Actinides
Write a short note.
Position of isotopes in the Mendeleev’s and the modern periodic table.
What is the number of elements in the 3rd period, of the modern periodic table?
Give the symbol and valency of the following element and radical.
Sulphate
Compare Modern Periodic Law with Mendeleev's Periodic Law.
Group 1 and 2 : s block : : group 13 and 18 : _______
In the modern periodic table, the positions of 1 to 20 elements are shown here. Identify the elements A and B. Write their atomic number.
