Ionic vs. Covalent Bonds: Differences, Real Examples, Lewis Structures and Practice Quiz
Understand ionic and covalent bonding with accurate real-world examples, step-by-step electron and charge reasoning, Lewis structures, and original study…
NEWSROOM / ARCHIVE
Chemistry & Periodic Table
Evidence-based U.S. physical science and chemistry lessons explaining atoms, elements, atomic numbers, periodic-table groups and periods, chemical properties and basic calculations with NIST and government science references.
How to Balance Chemical Equations: 5 Steps, Worked Examples and Practice Quiz
Quick answer: To balance a chemical equation, count the atoms of each element on both sides of the arrow…
How to Read the Periodic Table: Atomic Number, Groups, Periods and Practice Questions
Understand atomic number, chemical symbols, periods and groups, isotopes, and the difference between atomic mass and mass number, with…