If Ions x+2 and y 3- have the same number of electrons. How many protons if the atomic number of x is 12?​

They can measure  the amount of energy gained or lost

The molar mass of a substance is defined as the mass of 1 mol of that substance, expressed in grams per mole, and is equal to the mass of 6.022 × 10 23 atoms, molecules, or formula units of that substance.

Radioactive fallout is a result of the fission creation used to ignite the thermonuclear fusion reaction.

The answer is the third choice