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प्रश्न
Explain why, the properties of elements are repeated after 2, 8, 18 and 32 elements in the periodic table.
उत्तर
The electronic configurations are repeated because 2, 8, 18 and 32 are the maximum number of electrons that can be placed in the four atomic shells, namely, K, L, M and N. The properties of the elements are repeated after 2, 8, 18 and 32 because the electronic configurations of elements are repeated after 2, 8, 18 and 32.
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संबंधित प्रश्न
Differentiate between Normal elements and Transition elements.
Five elements A, B, C, D and E have atomic numbers of 2, 3, 7, 10 and 18 respectively. The elements which belong to the same period of the periodic table are:
(a) A, B, C
(b) B, C, D
(c) A, D, E
(d) B, D, E
How can the valency of an element be determined if its electronic configuration is known?
Fill in the blank
Most electropositive elements belong to ______ group.
Explain, the statement 'In each period, the atomic radii gradually decrease with increase in atomic number'. Give one example to justify your answer.
Atomic number of an element is 16. State
- the period to which it belongs
- the number of valence electrons
- whether it is a metal or non-metal
Arrange the following as per the instruction given in the bracket
He,Ar,Ne (Increasing order of the number of electron shells)
Name or state following with reference to the element of the first three periods of the periodic table.
The valency of the element in period 3 having atomic number 17.
Select the correct answer from the options given below.
Is the group number of the element whose atomic number is 4.
State the following:
The group which contains highly electropositive metals including sodium.
