26. The behavior of compounds during certain conditions that produce a series of events that Change its composition instó a new compound is called a A Physical reaction
B. Chemical reaction
C. Physical breakdown
D. Chemical breakdown

Where's the pictures ?

Crust,mantle,core,earth

Because electrons have negligible mass, to account for the mass of the isotope, there must be 16 neutrons, 16 neutrally charged, massive, fundamental particles present in the sulfur nucleus. and thus finally, if we have the 32s2− ion, there are 18 electrons, 16 protons, and 16 neutrons.