What is the position of an element in the periodic table if its electron configuration is 1s2 2s2 2p6 3s2 3p5
The element in the periodic table with the provided electron configuration is Chlorine. Cl it is found as in element in Group 7 of the periodic table.
Answer : The position of an element in the periodic table is, Group 17 and Period 3
Explanation :
The given electronic configuration is, \(1s^22s^22p^63s^23p^5\)
Total number of electrons = 17
Number of valence electrons = 2 + 5 = 7
In the given configuration, 3 is the highest principle quantum number. Therefore, it belongs to the 3rd period in the periodic table.
If the elements belongs to the p-block then we have to determine the group number by,
Group number = Number of valence electrons + 10
Group number = 7 + 10 = 17
Hence, the position of an element in the periodic table is, Group 17 and Period 3