Nucleus - Cell center, Proton - Positive particle, Electron - Negative orbiting particle, Orbital - Space region, Isotopes - Atoms with same proton number, Diagram - Explanatory drawing, Crystallization - Crystal formation, Acids - Proton-donating substances, Bases - Proton-accepting substances, Neutralization - Acid-base reaction, Ionic Bond - Bond between ions, Covalent compound - Compound with covalent bonds, Force of attraction - Particle-binding force, Chlorine - Halogene element", Electric charge - Particle charge, Dissociation - Ion separation, Atomic number - Proton count in an atom, Mass number - Proton and neutron sum, Chloride - Chlorine ion, Neon - Noble gas element, Methane - Combustible gas, Sodium - Alkali metal element, Calcium - Alkaline earth element, Carbon - Life fundamental element, Molecule - Bound atom group, Empirical formule - Simplified chemical formula, Oxygen - Life essential element, Hydrogen - Lightest chemical element, Proteins - Complex biomolecules, Nucleic acids - Genetic information molecules,

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