Periodic table

While memorising the entire periodic table is unnecessary, understanding how to read and interpret it is essential for A-Level chemistry. For instance, Group 1 elements, known as alkali metals (e.g., lithium, sodium, potassium), are highly reactive. The periodic table is divided into vertical columns known as groups and horizontal rows known as periods. As you move down, you’ll encounter elements with higher atomic numbers, such as Oganesson. At the top of the table, you’ll find elements like hydrogen, which constitutes about 90% of atoms.

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• The period number of an element is the same as the number of energy levels or ‘shells’ an atom of the element has.

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Elements are arranged in the periodic table based on atomic number and electronic configuration. The periodic table below is based on the ones used by the different examination boards. 3.1.4 Periodicity – Classification of elements in s, p and d blocks Save my name, email, and website in this browser for the next time I comment.