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absorb alpha rays ascertained astronomy atom of electricity atom of matter atom of radiation atomic nucleus atomic number atomic weight called chemical elements chemistry chlorine combine composed consist constitution continuous deal definite deflection discontinuous discovery distance drop earth ejected electric charge electric current electrified emitted empty space energy enormous number Ernest Rutherford ether waves evolution existence fact film fundamental give gradually heavenly bodies helium human hundredweight hydrogen idea inertia infer inside the atom J. J. Thomson jerk jump known light liquid magnetic mass measure million modern science molecules moving nature negative charges neutral nucleus number of atoms observe octave ordinary matter packed particles phenomena physical physicist planetary electrons planets plate possible orbits present protons pulse puzzling radium rays result revolving round single electron soap sodium solar system spectroscope spectrum speed stars structure substances temperature thickness things unit vacuum tube vibrations wave-length whole wireless