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प्रश्न
The electronic configuration of an element T is 2, 8, 8, 1.
What is the period number of T?
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उत्तर
With 4 shells T belong to period 4.
संबंधित प्रश्न
State how the valency of elements varies in a group of the periodic table?
Name two elements in each case: Lanthanides
Name an alkali metal in period 3 and halogen in period 2.
Write a short note.
Structure of the modern periodic table.
Write a short note.
Position of isotopes in the Mendeleev’s and the modern periodic table.
Give the symbol and valency of the following element and radical.
Oxygen [Oxide]
Position of A, B and C three elements is given in the table from the modern periodic table. Answer the following questions.
| Periods | Group 2 | Group 17 |
| 2 | ----- | A |
| 3 | B | ----- |
| 4 | ----- | C |
- What is A element metal or nonmetal?
- Which is the outermost orbit of element B?
- Identify C element and it's physical state.
State any five features of modern periodic table.
Define groups of modern periodic table.
A group of elements in the periodic table is given below (Boron is the first member of the group and Thallium is the last).
Boron, Aluminium, Gallium, Indium, Thallium
Answer the following question in relation to the above group of elements:
If the electronic configuration of aluminium is 2, 8, 3, how many electrons are there in the outer shell of thallium?
