Arsenic is a metalloid. A metalloid is an element that has properties of both metals and non-metals. Metalloids occur in the periodic table on either side of the staircase line that starts between boron and aluminum. When heated in air, arsenic combines with oxygen to form arsenic oxide (As 2 O 3).he toxic properties of arsenic compounds made them useful as rat poison. However, they are seldom used for this purpose today. Safer compounds are used that do not present a threat to humans, pets, and the environment. Today, the most important use of arsenic is in the preservation of wood.
According to California Women, Infants and Children Association, one flight of stairs averages 10 steps with a variable of the number of steps on the landings between floors. The number of calories burned climbing 90 steps plus the landing will depend on your how much you weigh and how fast you climb the stairs.
Types of Stairs. Stairs come in only two types: interior and exterior. Interior stairs include the stairs that go up to the higher floors in your house, the stairs that go to the attic, and the stairs that go down to your basement.