Ablock of lead has dimensions of 4.50cm by 5.20cm by 6.00 cm. the block weighs 1587 g. from this information, calculate the density of lead.

d = 11.3034 g/cm3

That is the density of it.

no but i do not usually comment or use my voice that much when it comes to social media

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.