An iron-carbon alloy initially containing 0.309 wt% c is exposed to an oxygen-rich and virtually carbon-free atmosphere at 1150°c. under these circumstances the carbon diffuses from the alloy and reacts at the surface with the oxygen in the atmosphere; that is, the carbon concentration at the surface position is maintained essentially at 0.0 wt% c. at what position will the carbon concentration be 0.232 wt% after a 7 h treatment? the value of d at 1150°c is 2.2 × 10-10 m2/s.

they are both synthetic elements

explanation:

d

28528289 29823282 8298232 39858

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.

plasma - state of matter made up of electrically charged particles