The idea that matter is made up of very small Chapter 3 Atomic Structure Testicles was first proposed by ____ in _____? The word postulate means Something assumed true? Element is a substance in which all atoms are similar, having same atomic number and cannot be divided into simpler substances by chemical methods.Total ----- elements exist which include -- natural and --- artificial? Define a solution? A homogeneous compound of different chemical substances throughout and shows uniform physical characteristics. Solute Chapter 7 Solution and Ssuspension icles are completely harmonized in the solvent and are not visible by naked eye and ---------- separated by filtration. What is binary solution? A solution formed by only two substances is a?