Let an atom with atomic number 119 is discovered today. Which group of the Periodic Table will be suitable for its placement?

Let, the element with atomic number 117 is discovered today.Which group of the periodic table wil be most suitable for it?Give reason.

An element with atomic number 20 will be placed in which period of the perodic table ?

The element A has atomic number 15. To which period of the periodic table the element belongs?

Modern periodic tables is based on the atomic number of the elements . The experiment which proved the significance of the atomic number was

Who showed that the atomic number of an element is a more fundamental property than its atomic mass and when?