Mercury's atomic emission spectrum is shown below.
hg
x (nm) 400 450 500 550 600 650 700
estimate the wavelength of the dark green line.
x m
enter a number, quency?
hz
what is the energy of an dark green photon emitted by the mercury atom?

im pretty sure its b

considering the question as per the attachment

here we can see that the radon nuclide has 222 as the atomic mass number and 86 as the atomic number.

when it undergoes nuclear fission it gives polonium which has atomic mass number as 218 and atomic number will be 84 along with a helium nucleus which has 4 atomic mass number and 2 as its atomic number.

222 = 218 + 4 (atomic mass number)

86 = ? + 2; therefore ? = 86-2 = 84.

the atomic mass number of polonium will be 84.

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