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2. Tantalum - Wikipedia

   en.wikipedia.org/wiki/Tantalum

   Tantalum is a chemical element; it has symbol Ta and atomic number 73. It is named after Tantalus , a figure in Greek mythology. [ 11 ] Tantalum is a very hard, ductile , lustrous , blue-gray transition metal that is highly corrosion-resistant.

3. Group 5 element - Wikipedia

   en.wikipedia.org/wiki/Group_5_element

   Group 5 is a group of elements in the periodic table.Group 5 contains vanadium (V), niobium (Nb), tantalum (Ta) and dubnium (Db). [1] This group lies in the d-block of the periodic table.

4. List of chemical elements - Wikipedia

   en.wikipedia.org/wiki/List_of_chemical_elements

   A chemical element, often simply called an element, is a type of atom which has a specific number of protons in its atomic nucleus (i.e., a specific atomic number, or Z). [ 1 ] The definitive visualisation of all 118 elements is the periodic table of the elements , whose history along the principles of the periodic law was one of the founding ...

5. Hardnesses of the elements (data page) - Wikipedia

   en.wikipedia.org/wiki/Hardnesses_of_the_elements...

   Toggle the table of contents. Hardnesses of the elements (data page) 10 languages. ... tantalum: 6.5: 873–1200: 441-3430: 441–1224 74: W:

6. Refractory metals - Wikipedia

   en.wikipedia.org/wiki/Refractory_metals

   The definition of which elements belong to this group differs. The most common definition includes five elements: two of the fifth period (niobium and molybdenum) and three of the sixth period (tantalum, tungsten, and rhenium). They all share some properties, including a melting point above 2000 °C and high hardness at room temperature. They ...

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8. Group (periodic table) - Wikipedia

   en.wikipedia.org/wiki/Group_(periodic_table)

   In the periodic table of the elements, each column is a group. In chemistry, a group (also known as a family) [1] is a column of elements in the periodic table of the chemical elements. There are 18 numbered groups in the periodic table; the 14 f-block columns, between groups 2 and 3, are not numbered.

9. Key warning signs about bird flu are all going in the wrong ...

   www.aol.com/key-warning-signs-bird-flu-170000168...

   The bird flu outbreak has taken concerning turns, with more than 60 human cases confirmed. Experts outlined four signs that the virus is going in the wrong direction.