1. Proprietatile fizice ale apei sunt: a) lichid incolor, fără gust si miros;
b) interacţionează cu oxizii anumitor metale şi nemetale;
c) fierbe la 100°C:
d) interacţionează cu o parte de metale;
e) îngheaţă la 0°C

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.