Fig. 19—Photographs of the tracks of

-particles ejected by x-rays from molecules of air

Fig. 20—Photographs of the tracks of

-particles ejected by x-rays from molecules of air

These sharp deflections, which occasionally amount to as much as 150° to 180°, lend the strongest of support to the view that the atom consists of a heavy positively charged nucleus about which are grouped enough electrons to render the whole atom neutral. But the fact that in these experiments the