Mixtures

Mixtures can be made up of elements and compounds. An example of a mixture is an alloy. An alloy is a mixture of metals with other elements(metals or non-metals such as carbon).
E.g
lemonade, yoghurt, milk, air

Compounds

A compound is a pure substance that contains two or more elements chemically combined. Compounds are named according to some naming rules. The smallest particle of a compound is a molecule or a formula unit. A compound can be represented by a chemical formula. It is written by putting together the chemical symbols of the elements that make up the compound. The chemical formula states the types of atoms (i.e. elements) present in the compound and the ratio of the different atoms present in the compound.
Heat can be used to form compounds. Heat can also be used to break down compounds into elements or simpler substances. This is also known as a thermal decomposition. Besides heat, electricity can also be used to break down compounds.

E.g
Sugar- C6H12O6
Carbon Dioxide- CO2
Water- H2O
Hydrogen peroxide- H2O (very corrosive)

The periodic table

THE PERIODIC TABLE

It progresses from the metals to the non-metals.

Its horizontal rows are called periods while the vertical rows are groups.

Beryllium

Beryllium

-Metal

-Steel-gray, strong, lightweight and brittle alkaline earth metal.

-Has a high specific heat and thermal conductivity, which makes it the metal with the best heat dissipation.

-Conductor of electricity and heat

Elements

Elements are the simplest substance and cannot be split further. Chemical symbols are used to represent elements. Elements can be classified as metals and non-metals. Elements are made of atoms, which have the properties of that element. Atoms can be chemically combined to form molecules.