The sodium ion may be abbreviated as Na+ or as simply Na. Sodium can occur as a salt in a crystalline solid. Sodium chloride (NaCl), sodium phosphate (Na2HPO4) and sodium bicarbonate (NaHCO3) are commonly occurring salts. These salts can be dissolved in water or in juices of various foods.
A Reference Point is something you use to determine the position of an object, but the reference point has to be something that doesn't move at all. For Example: A Tree. A Reference Point is something you use to determine the position of an object, but the reference point has to be something that doesn't move at all. For Example: A Tree.
focal point noun (INTEREST) âº [ C usually singular ] the thing that everyone looks at or is interested in: The fireplace is usually the focal point of the living room. focal point noun (SCIENCE) focal point in American English. focal pointnoun [ C ] âº art A focal point is the feature of a work of art that is the most interesting or important or the most strongly emphasized.