1isotopes are atoms of - a.) the same element with different numbers of neutrons b.) the same element with different numbers of protons c.) different elements with different numbers of neutronsd.) the same element with the same masses 2can penetrate paper , but not a thick sheet of aluminum a.) alpha b.) beta c.) gamma 3.half- life a.) is the mass of an isotope remaining after half a second b.) depends on temperature and pressure c.) is the time it takes for half the mass of a sample to decay d.) can be changed by varying the conditions in the lab 4.the shorter the half-life of a radioactive isotope , the dangerous it isa.) more b.) less
1isotopes are atoms of - a.) the same element with different numbers of neutrons 2can penetrate paper , but not a thick sheet of aluminum b.) beta 3.half- life c.) is the time it takes for half the mass of a sample to decay 4.the shorter the half-life of a radioactive isotope , the dangerous it isa.) more
