CHEMISTRY

The periodic table is a table which shows the arrangement of all the known chemical elements in order of increasing atomic number (number of protons in the nucleus) The elements with similar properties are placed in the same group (column).         The table is called "periodic" because elements with similar properties appear at regular intervals or periods.               Mendeleev's Periodic Table Dmitri Mendeleev in 1869, a Russian scientist created the first widely recognized periodic table.               Mendeleev's contributions 1. Mendeleev arranged elements in order of increasing atomic mass 2. He leaves gaps for undiscovered elements and successfully predicts their properties e.g Gallium, Germanium etc. 3. He grouped elements with similar properties together, even if the atomic mass order was slightly violated              The Modern Periodic Law ...

Matter is anything that has mass and occupies space. Examples of matter include; Air, water, rocks, plants, animals, and even people.  Matter is made up of one or more of the following: atoms, molecules, and ions.                  STATES OF MATTER   Matter exists in three different major states which are  1. Solid state  2. Liquid state   3. Gaseous state              PROPERTIES OF MATTER    The properties of matter can be grouped into two namely  1. Physical properties  2. Chemical properties          Physical properties of matter   Physical properties are properties that are associated with physical changes. The common physical properties include  1. Boiling point  2. Melting point  3. Density  4. Hardness  5. Malleability  6. Crystalline form etc  It also includes ...

CHEMISTRY  is a branch of pure science that deals with the study of the nature, structure, composition, properties, and uses of matter. The scientist who studies chemistry is called a CHEMIST             BRANCHES OF CHEMISTRY  The three main branches of chemistry are  1. Physical chemistry  2. Organic chemistry  3. Inorganic chemistry  Physical chemistry  deals with the physical aspects of chemistry such as quantum theory, heat, electricity, etc. Organic chemistry  deals with the study of carbon and its compounds Inorganic chemistry  deals with the study of elements, their properties, and uses REASONS FOR STUDYING CHEMISTRY The reasons for studying chemistry are:  1. To acquire knowledge about the matter 2. To give training in the scientific method 3. To meet basic needs such as food, clothing, shelter, health, etc 4. To provide solutions to problems 5. To explore new...