Summary Notes on The Periodic Table (Edexcel IGCSE)

THE PERIODIC TABLE
In 1869, a Russian scientist called Dimitri Mendeleev published his Periodic Table, which arranged the elements to
show patterns in their chemical properties. A few
adjustments were made and the modern Periodic
Table was introduced and became one of the
most important tools in chemistry.




ORGANISATION OF THE PERIODIC TABLE
Elements in the Periodic Table are arranged in rows called periods in order of increasing atomic number, with
each successive element containing one extra proton compared to element before them. The table is arranged in
columns called groups containing elements, which have similar chemical properties. The groups are numbered
from one to eight, skipping out the block of elements in the middle of the table.


Most of the Periodic Table consists of metallic elements, located on the left hand side of the table, with a zigzag line
separating the non-metallic elements on the right.


USING THE PERIODIC TABLE mass number
Each group or period contains several boxes that contain the nuclear symbol. The nuclear
y
symbol contains the elemental symbol, which is of one or two letters. On top of the elemental
symbol is the mass number, and on the bottom is the atomic number. The mass number and z x
atomic number can switch depending on the periodic table.
atomic number