the period of time needed for a radio isotope to lose one-half of its activity is known as that isotopes

Acontrol during an experiment. might change remains constant does not exist does change

How is the atomic number of a nucleus changed by alpha decay

Select all of the statements which are true. electrons are located in shells or orbits around the atom. electrons orbit slowly around the atom. electrons travel in one flat path around the nucleus of an atom. the valence of an atom is determined by the number of electrons in the atom's outermost shell.