Apr 25, 2026Learn what valency means in chemistry and how atoms combine based on their outermost electrons. Simple examples included.

Apr 25, 2026Discover Bohr's rule explaining how electrons orbit nuclei in fixed shells with quantized energy levels.

Apr 21, 2026Learn why atomic theory is classified as a scientific theory and how it explains the nature of matter.

Apr 20, 2026Learn about atomic number 33 in chemistry, which identifies arsenic, a unique metalloid used in pesticides and semiconductors.

Mar 7, 2026Learn about Pauli violations and explore an example that challenges quantum mechanics principles.