Atoms
Isotopes
Molecules
Compounds
Atoms are the smallest building blocks of elements. They are made from three types of subatomic particle: protons, neutrons and electrons.
- Therefore, an element is a pure substance made of atoms of only one kind. Elements occur naturally, with 118 elements included in the periodic table, starting from the first element, hydrogen (H), to the last element, oganesson (Og). Elements are represented using letters and symbols, either as a single capital letter, e.g., Hydrogen (H), or a capital and a small letter, e.g., Copper (Cu).
- It should be noted that all atoms of the same elements have the same number of protons, which is also referred to as the atomic number. This number is used in the grouping of elements in a periodic table.
- Dmitri Mendeleev is recognized as the father of the periodic table. Therefore, a periodic table can be defined as a table consisting of all the chemical elements, where elements are arranged according to their physical and chemical properties.
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