A 7.50 g sample of potassium-40 was collected. After 8.757 x 10^9 years,
0.05859 g of the sample remained. What is the half-life of potassium-40?

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.

Exothermic,  physical change after it is already baked

Ibelieve the answer is d. bleachhope my answer has you : )

Where is the illustration?