Polyesters and polyamides are types of synthetic polymer. Which statements are correct? 1. They are made by addition polymerisation. 2. They are made by condensation polymerisation. 3. The monomers from which they are made are unsaturated hydrocarbons. 4. The monomers from which they are made contain reactive functional groups at their ends A. 1 and 3 B.1 and 4 0.2 and 3 D.2 and 4

2b2t

explanation:

2b2t

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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.