What will be the atomic number of an element which belongs to period 8 and group 2.

What is the atomic number of the element present in the second period anf group 15.

Find the atomic number of element belonging to 4th period and 17th group in Modern periodic table :

If the atomic number of an element X is 17, then what will be the atomic number of the element lying in the same group as that of X but in the fifth period?

An element has electronic configuration 2, 8, 3. What is the atomic number of the element ? To which (i) group and (ii) period does this element belong ?