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

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

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

All elements in a group of the periodic table have the equal

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

Determine the position of metalloids in the periodic table.