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In the first paper of his trilogy, Bohr was able to derive it from his model: R_Z = { 2\pi^2 m_e Z^2 e^4 \over h^3 } where me is the electron's mass, e is its charge, h is Planck's constant and Z is the atom's atomic number (1 for hydrogen).
For instance, to a first approximation, 1 gram of hydrogen, which has a mass number of 1 (atomic number 1), has hydrogen atoms.
PubChem Substance and Compound contain atom types (r = 0) of all elements from atomic number 1 (hydrogen) to 109 (meitnerium).
It has the atomic number 1. Three nuclei with one proton are known that contain 0, 1, and 2 neutrons, respectively.
The three share the place in the periodic table assigned to atomic number 1 and hence are called isotopes (from the Greek isos, meaning "same," and topos, signifying "place") of hydrogen.
We investigate computationally the adsorption energies and migration energies in adsorption sites on graphene sheet for many atomic species, including transition metals, noble metals, nitrogen and oxygen, from atomic number 1 to 83, using the DFT calculation.
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A bar of pure uranium, for instance, would consist entirely of atoms with atomic number 92.
Gadolinium has the symbol Gd and atomic number 64.
Darmstadtium (Ds), artificially produced transuranium element of atomic number 110.
Roentgenium (Rg), artificially produced transuranium element of atomic number 111.
Copernicium (Cn), artificially produced transuranium element of atomic number 112.
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