The correct order of second ionization potential of carbon, nitrogen, oxygen, and fluorine is

The first ionization potential of Na, Mg, Al, and Si are in the order

The set representing the correct order of ionic radius is

Atomic radii of fluorine and neon in Angstrom units are respectively given by

Which one of the following is the smallest in size?

The correct order of atomic radii is

The correct sequence which shows decreasing order of the ionic radii of the elements is:

Among the elements Ca, Mg, P and Cl, the order of increasing atomic radii is:

The correct order of the decreasing ionic radii among the following isoelectronic species are

The element with the highest first ionization potential is