Elements: The Simplest Kind of Matter and the Periodic Table

Fundamental Concepts of Elements

• Definition of an Element: An element is a substance which cannot be split into two or more simpler substances by chemical reactions.
• Simplest Form of Matter: Elements are considered the simplest kind of matter because of their inability to be broken down further by chemical means.
• Marginalia and Annotations on Matter:
  • Constituents: All matter on Earth consists of elements.
  • Splitting Restrictions: While elements cannot be split by chemical substances or reactions, they are the primary building blocks.
  • Atoms: An atom is the smallest particle of an element.
  • Molecules: These are made of atoms. They can consist of $2$ or more than $2$ atoms, which can be either the same or different elements.

Discovery and Naming of Elements

• Total Count: Scientists have discovered more than $100$ elements so far.
• Natural vs. Man-made:
  • Naturally Occurring: Approximately $90$ of these elements occur naturally.
  • Synthetic: The remaining elements are man-made.
• Naming Conventions: Elements are sometimes named after famous scientists.
  • Example: The element Einsteinium is named after a famous scientist (Albert Einstein).