Atoms
The graphite refill used in pencil
is made up of element called Carbon. We can break the graphite into smaller and
smaller pieces. In fact, if we have an even finer knife, we can break it even
smaller. If keep cutting the minuscule graphite into smaller and smaller
particle, we will reach a point where we reach smallest constituent of
graphite- carbon atom. If we break that carbon atom apart, then it will no
longer exhibit the properties of carbon.
The smallest unit of an element that
exhibits the properties of the element is called as ‘atom’. All the matter is
composed of tiny particles called atom. Water , rice , in short
everything we see around is made up of atoms.
An
atom is the basic unit of a matter.
Even with the best of optical
microscope we cannot see atoms. However there are advanced instruments that
help us to image the atoms on the surface of a material.
For example the following figure
shows an image of the surface of silicon.
An
image of the surface of Silicon
The most abundant type of atom in the universe is
thehydrogen atom. Nearly 74%of the atoms in the universe are hydrogen atoms.
However on Earth the three most abundant atom are iron, oxygen, and silicon.
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