http://www.ck12.org Chapter 2. Matter
Elemental Properties
Each element has a unique set of properties that is different from the set of properties of any other element. For
example, the element iron is a solid that is attracted by a magnet and can be made into a magnet, like the compass
needle shown in theFigure2.7. The element neon, on the other hand, is a gas that gives off a red glow when
electricity flows through it. The lighted sign in theFigure2.8 contains neon.
FIGURE 2.7
The needle of this compass is made of the
element iron.FIGURE 2.8
The red lights in this sign contain the
element neon.Q:Do you know properties of any other elements? For example, what do you know about helium?
A:Helium is a gas that has a lower density than air. That’s why helium balloons have to be weighted down so they
won’t float away.
Q:Living things, like all matter, are made of elements. Do you know which element is most common in living
things?