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Interactive Periodic Table & Element FinderSearch elements by name, symbol, atomic number, or approximate atomic mass, then view atomic data and temperature state estimates.Score 126periodicelementatomicAtomic Number LookupFind an element by atomic number and view its symbol, mass, group, period, and category.Score 104atomicnumberperiodicElement FinderFind an element from its name, symbol, atomic number, or approximate atomic mass.Score 102elementatomicnumberQuantum Number CalculatorCheck simple quantum number ranges, shell capacity, and orbital counts.Score 50numberatomicAtomic Weight CalculatorLook up atomic weight and nearest matching elements by approximate atomic mass.Score 46atomicelementchemistrySymbol LookupFind full element names and atomic data from element symbols such as K, Fe, or Au.Score 46elementatomicchemistryNumber Comparison CalculatorCompare two values by difference, ratio, and percentage difference.Score 38numberKids Number Line CalculatorPractice addition jumps on a number line with visual movement and guided step explanations.Score 38numberElement State by Temperature CalculatorEstimate whether an element is solid, liquid, or gas at a selected temperature using melting and boiling points.Score 34elementchemistryAvogadro's Number CalculatorConvert moles to particles using Avogadro's number.Score 32numberchemistrySpin Quantum Number CalculatorCalculate spin multiplicity, spin states, and basic spin angular momentum estimates.Score 30numberMolarity CalculatorCalculate solution molarity from moles and volume.Score 22chemistrypH CalculatorCalculate pH from hydrogen ion concentration.Score 22chemistryIdeal Gas Law CalculatorCalculate moles of gas using pressure, volume, and temperature.Score 22chemistryMolecular Weight CalculatorCalculate approximate molecular weight from element masses and atom counts.Score 20chemistryatomicelementKids LCM CalculatorFind the least common multiple by listing colored multiples and spotting the first shared number.Score 16numberPercentage CalculatorCalculate percentages, percent change, discounts, increases, and reverse percentages.Score 14numberDilution CalculatorCalculate stock volume needed using C1V1 = C2V2.Score 14chemistryAverage CalculatorCalculate the average of four values.Score 14numberKids Addition CalculatorPractice addition with visual counters, guided steps, Learn Mode, and friendly checking.Score 14number