Question 1 of 25 What is an ionic solid?
O A. A crystalline solid held together by charge attractions
O B. A crystalline solid held together by dipole-dipole forces
O c. A crystalline solid held together by covalent bonds
D. A crystalline solid held together by a shared electron pool
LIONANT

c- cold periods in earth's history during which glaciers covered much of the surface.

explanation:

answer carbon and three oxygen atoms;

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.