Different types of periodic table

Periodic Table

A tabular arrangements of elements in groups and periods highlighting the regular trends in properties of elements is called periodic table.

Types of periodic table

i)Doberiner Triads

ii)Newland Law of Octaves

iii)Mendeleev periodic table

iv)Modern periodic table

Cause of periodicity

It is the recurrence of similar electronic configuration.

IONIC AND COVALENT BONDING ANIMATION

Ionic and covalent bonding

The bond which is formed by transfer of electrons from metal to non metal is called ionic bond or electrovalent bond.

The bond which is formed by sharing of electrons between atoms of element having same electro negativities is called covalent bond.

Water

Water is the most important natural resource, more than 70% of earth's surface is occupied by water.

The formula of water is H2O.
Water is a compound

• It is made up of two hydrogen and one oxygen in fixed proportion .
• The properties of water is different from the constituent elements.
• The elements which are present in water are separated by chemical means not by physical methods.

The circulation of water from earth's surface to the atmosphere by evaporation and back to the earth's surface by precipitation is known as water cycle.

CIRCLE AND ITS PROPERTIES

EXTRACTION OF ALUMINIUM FROM  BAUXITE

1. CONCENTRATION OF ORE - REMOVAL OF IMPURITIES
    IMPURE BAUXITE TO PURE ALUMINA 
2. CONCENTRATED ORE TO OXIDE
3. REDUCTION OF METALLIC OXIDE - BY ELECTROLYSIS
4. REFINING OF IMPURE METAL

Loreto Entally Chemistry

Structure of an atom

An atom is the smallest particle of an element which take part in a chemical reaction. It may or may not exist independently.

Atom contains protons, electrons and neutrons. Protons and neutrons are present inside the nucleus. Electrons revolve around the nucleus in a particular path which is called orbit or shell.

 

OHM'S LAW

OHM'S LAW

                                       OHM'S LAW

  It states that:

 The current flowing through a conductor is directly proportional to the potential difference between the two ends of the conductor provided that the temperature and other physical conditions remain the same.