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प्रश्न
An element A atomic number 7 mass numbers 14
B electronic configuration 2,8,8
C electrons 13, neutrons 14
D Protons 18 neutrons 22
E Electronic configuration 2,8,8,1
State Valency of each element
An element A atomic number 7 mass numbers 14
B electronic configuration 2,8,8
C electrons 13, neutrons 14
D Protons 18 neutrons 22
E Electronic configuration 2,8,8,1
State (i) Valency of each element (ii) which one is a metal (iii) which is non-metal (iv) which is an inert gas
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उत्तर
(i) Element A
Atomic number = 7 = Number of electrons = 2, 5
Valency of A = 8 - 5 = 3
Element B
Electronic configuration 2, 8, 8
Valency of B = Zero
Element C has 13 electrons
Electronic configuration = 2, 8, 3
Valency of C = 3
Element D
Protons = 18 = Electrons = 2, 8, 8
Valency of D = Zero
Element E
Electronic configuration = 2, 8, 8, 1
Valency of E = 1
(ii) C and E are metals.
(iii) A is a non-metal.
(iv) A, C and E are not inert gases.
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संबंधित प्रश्न
Explain the Atomic number with example.
Complete the following table.
| Atomic number | Mass number | Number of Neutrons | Number of protons | Number of electrons | Name of the Atomic species |
| 9 | - | 10 | - | - | - |
| 16 | 32 | - | - | - | Sulphur |
| - | 24 | - | 12 | - | - |
| - | 2 | - | 1 | - | - |
| - | 1 | 0 | 1 | 0 | - |
Multiple Choice Questions
The sum of number of protons and number of neutrons present in the nucleus of an atom is called its
FILL IN THE BLANK
Atomic theory of matter was given by ..........................
Fill in the blanks- The number of protons in the nucleus of an atom is called its ....................
An element has an atomic number 12. How many electrons will be present in the K, L and M energy shells of its atom?
What are orbits or shells of an atom?
Name the 3 sub-atomic particles of an atom.
When an atom gives electrons from its outermost shell, it becomes ______ charged.
______ = No. of protons = No. of the electrons.
