The number of elements in 5th and 6th period of periodic table are respectively:

8, 18

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18, 18

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18, 32

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18, 28

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Solution

The correct option is C 18, 32
The first period consists of only two elements – Hydrogen and Helium. The 2nd and 3rd period consists of 8 elements each. On the other hand, the 4th and 5th consists of 18 elements each while the sixth period consists of 32 elements.

Hence, the correct option is $C$

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Similar questions

Q. How would you justify the presence of

18

elements in the

5^{t h}

period of the Periodic Table?

Q. How many elements will be present in

5^{t h}

period of the periodic table? Justify using quantum numbers.

Q. Assertion :The

5^{t h}

period of periodic table contains 18 elements not 32. Reason:

n = 5, l = 0, 1, 2, 3

. The order in which the energy of available orbitals

4 d, 5 s

and

5 p

increases in

5 s < 4 d < 5 p

and the total number of orbitals available are 9 and thus 18 electrons can be accommodated.

(a) What are the usual number of valence electrons and valency of group 18 elements of the periodic table?

(b) What happens to the number of valence electrons in the atoms of elements as we go down in a group of the periodic table?

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

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The number of elements in 5th and 6th period of periodic table are respectively:

The correct option is C 18, 32The first period consists of only two elements – Hydrogen and Helium. The 2nd and 3rd period consists of 8 elements each. On the other hand, the 4th and 5th consists of 18 elements each while the sixth period consists of 32 elements.Hence, the correct option is C