3. Fill the paint cup about 2/3 of the way with paint and lock it onto the sprayer. Whether the spray cup attaches to the bottom of the sprayer with a clamping assembly and hooks or screws on, be sure to attach it securely; you do not want the spray cup to drop off suddenly while in use.
The periodic table provides a useful framework for analyzing chemical behaviour, and is widely used in chemistry and other sciences. Dmitri Mendeleev published in 1869 the first widely recognized periodic table. He developed his table to illustrate periodic trends in the properties of the then-known elements.
A necessary prerequisite to the construction of the periodic table was the discovery of the individual elements. Although elements such as gold, silver, tin, copper, lead and mercury have been known since antiquity, the first scientific discovery of an element occurred in 1649 when Hennig Brand discovered phosphorous.