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THE ATOMIC THEORY OF JOHN DALTON
ATOMs AND MOLECULES FROM THE POINT
v1 THE HYDROGEN ATOM
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a-particles atomic number atomic weight Balmer’s beam beryllium black body radiation Bohr Bohr’s BOYLE’s LAW called carbon charged particles chemical chlorine cloud compound conﬁrmed consists cosmic radiation Dalton’s deﬁnite degrees of freedom distance ejected electric ﬁeld electrolysis electron orbits elementary charge elements emission emitted equal fact ﬁgure ﬁnd ﬁrst ﬂowing ﬂuorescence ﬂying formula frequency gases gramme heat helium helium nucleus hydrogen atom hydrogen chloride indicated ions isotope J. J. Thomson kinetic energy later light lithium magnetic ﬁeld mass number material means measured mechanics meson molecules momentum motion naturally negative neutrons nucleus number of molecules observed oxygen phenomena physicist Planck’s Planck’s constant pole positive charge positron pressure principle produced proportional protons quantity quantum theory radioactive ratio Rydberg’s constant signiﬁcance simple sodium spectral line spectral terms spectrum suggested temperature tion tube uranium velocity wave wave-length wave-numbers whole number X-rays