AS90944
Demonstrate understanding of Acids and Bases
The Periodic Table
There are 118 known elements which are arranged in order of increasing atomic number in the Periodic Table.
The vertical columns are called groups - Elements in the same group have the same number of electrons in their valence shell so have similar chemical properties.
The horizontal rows are called periods - Elements in the same period have the same number of electron shells. Across the period, from the left, the outer shell starts with one electron and then increases by one for each element until an outer shell of 8 for the last element at the right hand side of the period.
Group 1 - Alkalai Metals
Group 2 - Alkaline earth Metals
Group 17 - Halogens
Group 18 - Noble gases
The Periodic Table
Understanding the structure of an atom helps us to understand how elements were placed within the Periodic Table.
Did you know...Oxygen makes up 65% of your body weight. Click on the link to find out what the other elements are that make up the human body
The Periodic Table
The Periodic Table is a way to order the elements according to their different properties. It was first created by Dimitri Mendeleev in 1869 with just 63 elements identified. His original table had 'gaps' left which slowly were filled as the 'missing' elements were discovered.
https://corrosion-doctors.org/Periodic/Periodic-Mendeleev.htm