Answer :
All the elements in group 17 will have a blank configuration in their outermost energy level P5.
The periodic table is an arrangement of all known elements according to increasing atomic number and repeating chemical properties. They are arranged as a table, where a row represents an era and a column a group. E elements are arranged by atomic number in increasing order from left to right and from top to bottom. Thus, elements in the same group have the same valence electron configuration and therefore have comparable chemical properties.
Each set of elements has an equal number of electrons in the outer orbit. Valence electrons are another name for outer electrons. These are electrons that interact with other elements in a chemical bond. Each element of the first group in the first column has one electron in the outer shell.
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