The periodic table arranges elements in order of increasing atomic number and groups elements with similar chemical and physical properties. Elements are organized into rows called periods and columns called groups. The periodic table can be used to determine the number of protons, electrons, and neutrons in an atom based on its atomic number and mass number. Elements in the same group have the same number of electrons in their outer shell, which is equal to the group number for groups 1 to 7. Noble gases make up group 0 and are unreactive because their outer shell is full.

1. Crazy rainbow SASA

2. What is it?
 A table in which elements are arranged in the
order of increasing atomic number and in terms
of chemical and physical properties
 The vertical columns in the table are called groups
 The horizontal rows in the periodic table are
called periods
 The lanthanides and actinides are usually written
separately at the bottom as it is easy to read

4. Finding out!
A periodic table can be used to work out:
 The no of protons in an atom is equal to atomic number
 The no of electrons is equal to number of protons
 The number of neutrons = mass number – atomic number

5. Remember
Two important facts :
 Elements in the same group in the periodic table have
same number of electrons in their outer shell
The number of electrons in the outer shell is the same as
the group number for groups to 1 to 7

6. Noble gases
 The group zero elements are known as the noble gases
because they are almost completely unreactive.
 They are unreactive because the outer shell is full,and
so there is no tendency to lose,gain or share electrons
in a chemical reaction.

7. Metals and non metals

8. THANKS A LOT FOR
WATCHING .PLEASE
DON’T FORGET TO
LIKE, SHARE AND
SUBSCRIBE