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How many valence electrons doeschromium have? |
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Answer» Chromium has six valence electrons. Valence electrons are located on the outermost shell, or energy level, of an atom. According to the Aufbau principle (also known as the building-up principle), electrons tend to fill the lowest available energy levels before starting to fill the higher energy levels. In cases where there are multiple orbitals of the same energy level, electrons fill up the unoccupied levels before having to pair with other electrons. Like chromium, copper and palladium are some of the elements that do not follow the general rule. For chromium, the 4s shell is lower on the orbital than the 3d shell. When the electrons are filling up the energy levels, both the 3d shell and the 4s shell have one electron in their orbitals. This is because electrons tend to occupy energy levels that are not already occupied before they start pairing. However, this means that there are valence electrons in both the 3d shell and the 4s shell. |
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