Valency and Atomic Number of Common Elements Valency refers to the maximum number of atoms of a specific element that can combine with one atom of another el...
Valency refers to the maximum number of atoms of a specific element that can combine with one atom of another element. It is determined by the atom's outermost energy level, which dictates its chemical behavior. Elements in the same group of the periodic table tend to share similar valency, indicating their similar chemical characteristics.
Atomic number: This is the number of protons in the nucleus of an atom. It uniquely identifies an element and determines its atomic properties, including valency. The atomic number of an element is the same regardless of its location in the periodic table.
Examples:
Valency of Hydrogen: Hydrogen has valency 1, meaning it can combine with one atom of another element to form H2 molecules.
Valency of Oxygen: Oxygen has valency 8, indicating it can combine with two atoms to form O2 molecules.
Valency of Sodium: Sodium has valency 1, meaning it can combine with one atom of another element to form Na atoms.
Remember, valency is not the same as reactivity. Reactivity refers to an element's tendency to react with other elements to form compounds. Different elements have different valencies, influencing their chemical behavior.
By understanding valency and atomic number, students can predict the chemical properties of elements and form compounds with specific characteristics