how does a electronic configuration of an atom relate to the position in the modern periodic table.
Answers
To know its position in periodic table first we should know the electronic configuration of the element. For example Oxygen. Atomic number of Oxygen is 16 Electronic configuration of oxygen - 2 8 6. Valence electrons: The electrons, which are present in the outermost shell of an atom are called valence electrons. For any element number of valence electrons is equal to its group number. Here oxygen contains 6 valence electrons hence, it belongs to VI A group. For any element the valence shell number is equal to its period number. In oxygen 3rd shell is the outermost shell (Valence shell) hence, it belongs to period 3.
Explanation:
In the modern periodic table, atoms with similar electronic configurations are placed in the same column. In a group, the number of valence electrons remains the same.
Elements across a period show an increase in the number of valence electrons.