![]() ![]() In this model n = ∞ corresponds to the level where the energy holding the electron and the nucleus together is zero. When looking at Bohr models, we look at its valence electrons (the electrons on the last energy level) to determine reactivity. ![]() Ancient Greek thinkers already believed that matter was composed of tiny. In 1961 the isotope carbon-12 was selected to replace oxygen as the standard relative to which the atomic. Although widely distributed in nature, carbon is not particularly plentifulit makes up only about 0.025 percent of Earth’s crustyet it forms more compounds than all the other elements combined. Reactivity refers to how likely an element is to form a compound with another element. determined that these electrons had a negative electric charge and compared to the atom had very little mass. The Bohr model, introduced by Danish physicist Niels Bohr in 1913, was a key step on the journey to understand atoms. carbon (C), nonmetallic chemical element in Group 14 (IVa) of the periodic table. In order for an electron to be in the electron cloud of an atom, it must be in one of the allowable orbitals and it must have the precise energy required for that orbit. ![]() \) is the Rydberg constant in terms of energy, Z is the atom is the atomic number, and n is a positive integer corresponding to the number assigned to the orbit, with n = 1 corresponding to the orbit closest to the nucleus. Bohr models are used to predict reactivityin elements. Bohr's key idea in his model of the atom is that electrons occupy definite orbits that require the electron to have a specific amount of energy. ![]()
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