
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 .
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.
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.
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.
PERIOD | Period Subshell | Number of elements |
1 | 1s | 2 |
2 | 2s,2p | 8 |
3 | 3s, 3p | 8 |
4 | 4s, 3d, 4p | 18 |
5 | 5s, 4d, 5p | 18 |
6 | 6s, 4f, 5d, 6p | 32 |
7 | 7s, 5f, 6d | 26 |
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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