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The elements with atomic number 39 to 48 belong to:
A.Fourth period
B.Fifth period
C.Sixth period
D.Third period

Answer
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Hint:Maximum value of n from an electronic configuration of an element represents its period. For example: Electronic configuration of atomic number 39 is 4d15s2 .

Complete step by step answer:
In modern periodic tables, elements are arranged in such a way that the physical and chemical properties of an element are periodic functions of its atomic number. Modern periodic table consists of 18 vertical columns or groups and 7 periods. Elements belong to the same group having the same number of electrons in the outermost shell so their properties are similar. Period 1 has 2 elements and extends from atomic number 1 to 2. Period 2 has 8 elements and extends from atomic number 3 to 10. Period 3 has also 8 elements and extends from atomic number 11 to 18. Period 4 has 18 elements and extends from atomic number 19 to 36. Period 5 also has 18 elements and extends from atomic number 37 to 54. Period 6 has 32 elements and extends from atomic number 55 to 86. Period 7 at present has 26 elements and extends from atomic number 87 to 112.
PERIODPeriod SubshellNumber of elements
11s2
22s,2p8
33s, 3p8
44s, 3d, 4p18
55s, 4d, 5p18
66s, 4f, 5d, 6p32
77s, 5f, 6d26

 Elements of group 1 to 2 are known to be s block elements where elements of group 1 are known as alkali metal and elements of group 2 are known as alkaline earth metal. Elements belong from group 13 to 18 are known to be p block elements. Elements of group 18 are also known as inert gases. D block starts from group 3 to group 12 and extends from period 4 to period 7. F block elements all have group 3 and extend from period 6 to 7.

Thus, the correct option is B.

Note:
Atomic number from 39 to 48 is from Yttrium to Cadmium. These have period number 5 and belong to a 4f series of d block elements.
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