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In the modern periodic table, elements a...

In the modern periodic table, elements are arranged in order of increasing atomic numbers, which is related to the electornic configuration. Depending upon the type of orbitals receiving the last electron, the elements in the periodic table have been divided into four blocks, s, p,d and f. The modern periodic table consists of 7 periods and 18 groups. Each period begins with the filling of a new energy shell. in accordance with the Aufbau principal, the seven periods (1 to 7) have 2,8,8,18,18,32 and 32 elements respectively. The seventh period is still incomplete. To avoid the periodic table being too long, the two series of f-block elements, called lanthanoids and actinoids, are placed at the bottom of the main body of the periodic table
Which of the element whose atomic numbers are given below, cannot be accommodated in the present set up of the long form of the periodic table ?

A

107

B

118

C

126

D

102

Text Solution

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The correct Answer is:
To determine which of the given atomic numbers cannot be accommodated in the present setup of the long form of the periodic table, we need to analyze the total number of elements that the current periodic table can hold. ### Step-by-Step Solution: 1. **Understanding the Structure of the Modern Periodic Table**: - The modern periodic table consists of 7 periods and 18 groups. - Each period corresponds to the filling of a new energy shell. 2. **Identifying the Number of Elements in Each Period**: - The number of elements in each period is as follows: - Period 1: 2 elements - Period 2: 8 elements - Period 3: 8 elements - Period 4: 18 elements - Period 5: 18 elements - Period 6: 32 elements - Period 7: 32 elements (currently incomplete) 3. **Calculating the Total Number of Elements**: - We sum the number of elements in each period: - Total = 2 + 8 + 8 + 18 + 18 + 32 + 32 - Total = 118 elements 4. **Analyzing the Given Atomic Numbers**: - The atomic numbers provided are: 107, 118, 126, and 102. - We need to check which of these atomic numbers exceeds the total number of elements (118). 5. **Identifying the Element that Cannot be Accommodated**: - Atomic number 107: Can be accommodated (within 118). - Atomic number 118: Can be accommodated (exactly 118). - Atomic number 126: Cannot be accommodated (exceeds 118). - Atomic number 102: Can be accommodated (within 118). 6. **Conclusion**: - The element with atomic number **126** cannot be accommodated in the present setup of the long form of the periodic table. ### Final Answer: The element with atomic number **126** cannot be accommodated in the present setup of the long form of the periodic table.
To determine which of the given atomic numbers cannot be accommodated in the present setup of the long form of the periodic table, we need to analyze the total number of elements that the current periodic table can hold. ### Step-by-Step Solution: 1. **Understanding the Structure of the Modern Periodic Table**: - The modern periodic table consists of 7 periods and 18 groups. - Each period corresponds to the filling of a new energy shell. ...
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