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THE ATOMIC THEORY or JOHN DALTON
ATOMS AND MOLECULES FROM THE POINT
v11 THE HELIUM AToM
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a-particles atomic number atomic weight beam beryllium black body radiation Bohr Bohr’s BoYLE’s LAW called carbon charged particles chemical chlorine cloud compound conﬁrmed consists cosmic radiation Dalton 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 kinetic energy later light lithium Loschmidt’s 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 solution speciﬁc spectral line spectral terms spectrum suggested temperature Thomson tion tube uranium velocity wave wave-length wave-numbers whole number X-radiation X-rays