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Hace 2 días · In particle physics, the Dirac equation is a relativistic wave equation derived by British physicist Paul Dirac in 1928. In its free form, or including electromagnetic interactions, it describes all spin-1/2 massive particles, called "Dirac particles", such as electrons and quarks for which parity is a symmetry.
2 de may. de 2024 · Bohr model, description of the structure of atoms, especially that of hydrogen, proposed (1913) by the Danish physicist Niels Bohr. The Bohr model of the atom, a radical departure from earlier, classical descriptions, was the first that incorporated quantum theory and was the predecessor of wholly quantum-mechanical models.
- The Editors of Encyclopaedia Britannica
7 de may. de 2024 · Por ejemplo: • Sabemos que la masa de un átomo (u) es un promedio ponderado determinado principalmente por sus protones (p) y neutrones (n0), mientras que el número de protones (p) y electrones (e-) determina su carga. - Entendemos que cada átomo de un elemento contiene el mismo número de protones, llamado número atómico (Z).
