Name the element which is in:
(a) first group and third period: (b) seventeenth group and second period.

What is the value of (n+l) for the unpaired e^(-) in an atom of an element which is present in the 3rd period and seventeenth group of the periodic table.

Write the atomic number of the element present in the third period and seventeenth group of the periodic table.

Write the atomic number of the element present in the third period and seventeenth group of the periodic table.

Write the atomic number of the element, present in the third period and seventeenth group of the periodic table.

Write the atomic number of the element present in the third period and seventeenth group of the periodic table.

Write the atomic number of the element, present in the third period and seventeenth group of the periodic table.

Name the element which belongs to group 17 and period 2 of the modern periodic table.

Write the atomic number.of the element in the third period and seventeenth group of the periodic table.