Understanding Pure Substances and Elements Pure substances cannot be divided into simpler substances by physical or chemical methods. Examples include iron, which is a pure element with consistent properties throughout. There are 118 known elements, categorized as metals, non-metals, and metalloids.
Classification of Metals and Non-Metals Metals like iron and copper conduct electricity well due to their structure. Non-metals such as hydrogen or sulfur have different characteristics compared to metals. Metalloids exhibit mixed properties of both categories.
Atomic Structure Basics Atoms are the smallest units retaining all elemental properties; they consist of protons, neutrons, and electrons arranged in specific configurations around the nucleus.
'Symbolism' for Universal Understanding 'Symbols' represent elements universally (e.g., Fe for Iron), simplifying communication across languages while maintaining scientific accuracy globally.
'Atomic Number': Defining an Element's Identity. An atomic number equals the count of protons within its atom defining unique identity among periodic table members ensuring distinctiveness scientifically recognized worldwide!