Page 102 - Science Class 6 Times Publication

Metalloids

The elements which are poor conductors of heat and electricity are
called metalloids. For example, silicon, germanium, arsenic, etc.

The substances which are composed of two or more types of atoms are
called compounds. Since, compounds contain two or more types of
atoms, they can be further divided into other substance. For example,
water, carbon dioxide, sodium chloride (salt), etc are compounds.

Water is composed of atoms of hydrogen and oxygen. It can be divided
into hydrogen and oxygen.

Differences between element and compound

Element Compound
1. It is a type of substance which 1. It is a type of substance which
is composed of only one kind is composed of two or more
of atoms. kinds of atoms.

2. It cannot be further divided 2. It can be further divided into
by chemical method. its components by chemical
method.

3. Examples: oxygen, nitrogen, 3. Example: water, carbon
iron, aluminium, etc. dioxide, ammonia, etc.

Mixture
When two or more non-reacting substances are kept together, mixture
is formed. During the formation of mixture, mixing substances do not
lose their properties. For example, when we mix sugar and sand,
they do not lose their properties. They remain together only but do
not undergo chemical change. Thus, mixture of sugar and sand is
formed. The mixing substances are called components of mixture.
Here, sand and sugar are components of mixture. They can be mixed
in any proportion.

Thus, mixture is a substance which is formed by mixing two or more

substances in any proportion by weight.

Times' Crucial Science and Environment 98 Book 6