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For the form of anemia, see Hypochromic anemia. A corn plant with severe chlorosis (left) beside a normal plant (right). In botany, chlorosis is a condition in which leaves produce insufficient chlorophyll. As chlorophyll is responsible for the green color of leaves, chlorotic leaves are pale, yellow, or yellow-white.n viticulture, the most common symptom of poor nutrition in grapevines is the yellowing of grape leaves caused by chlorosis and the subsequent loss of chlorophyll.
The periodic Table has 7 periods and 18 groups. The number of valence electrons in an atom of sulfur is 6, calcium has 2, chlorine has 7 and arsenic has 5. The element that corresponds to the atomic number 10 is Neon, for 18 it is argon, for 36 it is krypton, and for 90 it is thorium. Na and CI belong to the same period, as does H and He. An element found in period 4 would have 4 energy levels. The transition elements are in groups 3-12.