The last one. A bond of two or more of the same element.
Answer:
91.1835 nm
Explanation:
Given that the ionization energy of the oxygen molecule = 1314 kJ/mol
It means that
1 mole of oxygen molecules can be ionized by the energy = 1314 kJ = 1314000 J
1 mole of molecules contains 6.022 × 10²³ atoms
So,
6.022 × 10²³ atoms of oxygen molecules can be ionized by the energy = 1314000 J
1 atom require
of energy
Energy = 
Also
Where,
h is Plank's constant having value
c is the speed of light having value 
is the wavelength
So,
Also,
So, wavelength = 91.1835 nm
Because this classification contrasts with that of crystalline solids whose atoms are arranged in a regular and orderly fashion forming crystalline networks.
Group 2
Period 3
Alkaline Earth Metal