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2. Periodic Table of Elements - PubChem

   pubchem.ncbi.nlm.nih.gov/periodic-table

   Interactive periodic table with up-to-date element property data collected from authoritative sources. Look up chemical element names, symbols, atomic masses and other properties, visualize trends, or even test your elements knowledge by playing a periodic table game!

3. Atomic Mass | Periodic Table of Elements - PubChem

   pubchem.ncbi.nlm.nih.gov/periodic-table/atomic-mass

   Explore how atomic mass changes with atomic number in the periodic table of elements via interactive plots.

4. Density | Periodic Table of Elements - PubChem

   pubchem.ncbi.nlm.nih.gov/periodic-table/density

   Explore how density changes with atomic number in the periodic table of elements via interactive plots.

5. Potassium | K (Element) - PubChem

   pubchem.ncbi.nlm.nih.gov/element/Potassium

   Periodic Table element Summary Potassium. Potassium is a chemical element with symbol K and atomic number 19. Classified as an alkali metal, Potassium is a solid at room temperature.

6. Electronegativity | Periodic Table of Elements - PubChem

   pubchem.ncbi.nlm.nih.gov/periodic-table/electronegativity

   Explore how electronegativity changes with atomic number in the periodic table of elements via interactive plots.

7. Yttrium | Y (Element) - PubChem

   pubchem.ncbi.nlm.nih.gov/element/Yttrium

   Periodic Table element Summary Yttrium. Yttrium is a chemical element with symbol Y and atomic number 39. Classified as a transition metal, Yttrium is a solid at room temperature.

8. Melting Point | Periodic Table of Elements - PubChem

   pubchem.ncbi.nlm.nih.gov/periodic-table/melting-point

   Explore how melting point changes with atomic number in the periodic table of elements via interactive plots.

9. Atomic Radius | Periodic Table of Elements - PubChem

   pubchem.ncbi.nlm.nih.gov/periodic-table/atomic-radius

   Explore how atomic radius changes with atomic number in the periodic table of elements via interactive plots.

10. Sodium | Na (Element) - PubChem

    pubchem.ncbi.nlm.nih.gov/element/Sodium

    Periodic Table element Summary Sodium. Sodium is a chemical element with symbol Na and atomic number 11. Classified as an alkali metal, Sodium is a solid at room temperature.

11. Ionization Energy | Periodic Table of Elements - PubChem

    pubchem.ncbi.nlm.nih.gov/periodic-table/ionization-energy

    Explore how ionization energy changes with atomic number in the periodic table of elements via interactive plots.