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प्रश्न
Write the electronic configuration of element 17T35.
- What is the group number of T?
- What is the period number of T?
- How many valence electrons are there in an atom of T?
- What is the valency of T?
- Is it a metal or non-metal?
- State number of protons and neutrons in T.
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उत्तर
K L M
Electronic configuration = 2, 8, 7
- VIIA
- Third period
- Seven
- Valency of T = -1
- Non-metal
- Protons = 17, Neutrons = 18
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संबंधित प्रश्न
Write any one difference in the electronic configurations of group-1 and group-2 elements ?
How does the atomic size vary on going down from top to bottom in a group of the periodic table? Why does it vary this way?
Why does the size of the atoms progressively become smaller when we move from sodium (Na) to chlorine (Cl) in the third period of the periodic table?
What do you understand by periodicity?
In the following table, the positions of six elements A, B, C, D, E and F are given as they are in the Modern Periodic Table :
 |
1 | 2 | 3-12 | 13 | 14 | 15 | 16 | 17 | 18 |
| 2 | A | B | C | D | |||||
| 3 | E | F |
On the basis of the above table, answer the following questions :
(i) Name the element which forms only covalent compounds.
(ii) Name the element which is a metal with valency three.
(iii) Name the element which is a non-metal with valency three.
(iv) Out of B and C, whose atomic radius is bigger and why ?
(v) Write the common name for the family to which the elements D and F belong.
Fill in the blank
Most electropositive elements belong to ______ group.
Select the correct answer
Identify the metalloid
Name the period which is the shortest period of the periodic table.
Name or state following with reference to the elements of the first three periods of the periodic table.
The number of electron shells in elements of period 1, period 2, and period 3.
Select the correct answer from the options given below.
Is the group number of the element whose atomic number is 4.
