Atomic Number - GCSE Chemistry Definition

The atomic number is a fundamental property of an element that indicates the number of protons found in the nucleus of an atom of that element. It is symbolised as 'Z' and is unique to each element, defining the identity of the element within the Periodic Table.

The atomic number also determines the order of elements in the periodic table, with each element having a distinct position based on its atomic number.

Since protons are positively charged particles, the atomic number also indirectly tells us about the number of electrons in a neutral atom, which in turn influences the chemical behaviour of the element. Understanding atomic numbers is essential for students studying GCSE Chemistry, as it helps them predict how different elements will interact in chemical reactions.