Elements are arranged by increasing atomic number in rows
Elements with the similiar chemical properties are arranged in vertical columns called groups.
Group = How many electrons in outermost shell
Period = How many shells
How is the electronic configurstion of an atom related to its position of the periodic table?
Group = how many electrons in outermost shell, Period = how many shells
How did Mendeleev organise his periodic table
He ordered elements by atomic mass but not strictly and left gaps for undiscovered elements.
Mendeleev thought he arranged the elements in order of increasing atomic weight but it wasn't always accurate due to the discovery of relative abundance of isotopes.
The number of electrons in the outermost shell of a particular atom determines its reactivity, or tendency to form chemical bonds with other atoms
