What is a stair step line?
Along the stair-step line are the metalloids, which have properties of both metals and nonmetals. The nonmetals are located to the right of the stair-step line on the periodic table. Metals tend to lose electrons in chemical reactions, forming positive ions.
What is the stair step line on a periodic table called?
Metalloids
Metalloids can also be called semimetals. On the periodic table, the elements colored yellow, which generally border the stair-step line, are considered to be metalloids. Notice that aluminum borders the line, but it is considered to be a metal since all of its properties are like those of metals.
What does the stair step line divide?
With the exception of HYDROGEN, the elements on the left side of the periodic table are METALS. Elements on the right side of the periodic table are NONMETALS. The staggered stair step on the periodic table divides the metals from the nonmetals.
What is the purpose of the heavy stair step line on the periodic table?
Draw a HEAVY BLACK stair step line (using a marker) on your periodic table to show the location of the metalloids. This line also separates the metals from the non-metals.
What is special about metalloids?
Metalloids are unique because they have properties of both metals and non-metals. For example, boron acts as a nonmetal when it reacts with sodium, but it acts as a metal when it reacts with fluorine. Most metalloids have a metallic lustre but are poor conductors of heat and electricity.
Where is the metalloid line?
Metalloids lie on either side of the dividing line between metals and nonmetals. This can be found, in varying configurations, on some periodic tables. Elements to the lower left of the line generally display increasing metallic behaviour; elements to the upper right display increasing nonmetallic behaviour.
What does the line on the periodic table mean?
There is a zig-zag line toward the right side of the periodic table that acts as a sort of border between metals and nonmetals. Elements on either side of this line exhibit some properties of metals and some of the nonmetals. These elements are the metalloids, also called semimetals.
What does the line in the periodic table mean?
Why are metalloids useful?
Metalloids are usually too brittle to have any structural uses. They and their compounds are used in alloys, biological agents, catalysts, flame retardants, glasses, optical storage and optoelectronics, pyrotechnics, semiconductors, and electronics.
How many nonmetals are there?
Seventeen elements are generally classified as nonmetals; most are gases (hydrogen, helium, nitrogen, oxygen, fluorine, neon, chlorine, argon, krypton, xenon and radon); one is a liquid (bromine); and a few are solids (carbon, phosphorus, sulfur, selenium, and iodine).
What is the definition of a stair step?
Definition of stair-step (Entry 3 of 3) : resembling the steps in a stairway stair-step levels of terrain especially : moving up or down like steps in a stairway stair-step inflation.
What is line of walking in stair case?
It is the vertical distance between the line: of nosing and this under surface or ceiling of the stair-case or the next flight. Line of walking. The tendency of a person going on the stair is to walk along a line which is nearly 45 cm from the centre of the hind rail. This imaginary line is called Line of walking.
What do you call the string on a staircase?
String Margin – the distance between the top of the string and the pitch line measured at 90° to the pitch line. Tread – the top or horizontal surface of a step. Wall String – the string of a staircase fixed flush with a wall.
What are the dimensions of a flight of stairs?
The maximum individual rise for domestic flights is 220mm. Stairway/Stairwell – the space/void provided for the stairs. Step – the tread and riser combined. and the pitch line measured at 90° to the pitch line. Tread – the top or horizontal surface of a step. Wall String – the string of a staircase fixed flush with a wall.