Properties
Every single one of these elements are stable, and many are extremely common in the earth's crust and/or core. Many of the transition metals in period 4 are incredibly strong, and therefore commonly used in industry, especially iron. Copper is one of three elements that are not silver or gray in color, along with caesium and gold. Two adjacent elements are known to be toxic, with arsenic one of the most well-known poisons, and selenium being toxic to humans in large quantities. Many elements are essential to humans' survival, such as Calcium being what forms bones.
Read more about this topic: Period 4 Element
Famous quotes containing the word properties:
“A drop of water has the properties of the sea, but cannot exhibit a storm. There is beauty of a concert, as well as of a flute; strength of a host, as well as of a hero.”
—Ralph Waldo Emerson (1803–1882)
“The reason why men enter into society, is the preservation of their property; and the end why they choose and authorize a legislative, is, that there may be laws made, and rules set, as guards and fences to the properties of all the members of the society: to limit the power, and moderate the dominion, of every part and member of the society.”
—John Locke (1632–1704)