First slide

Electronic configuration and Atomic , physical properties

Question

Atomic number of the $17^{th}$ group element present in $7^{th}$ period is

Moderate

A

117
B

85
C

115
D

113

Solution

$Astatine - At (Z = 85) is present in 17^{th} group and 6^{th} period; So the next element in the group will have the atomic number = 85 + 32 = 117; Z = 117 - Ts - Uus - Tennessine$

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