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It is a blue-gray, very hard metal with the fourth highest melting point of any metallic element. Interesting Tantalum  by Charles Hatchett.

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It is a blue-gray, very hard metal with the fourth highest melting point of any metallic element. Interesting Tantalum  by Charles Hatchett.

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Niobium (Nb) has an atomic number of forty-one. This shiny white member of the metallic elements was originally called columbium, until its current name was adopted in 1950.

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Niobium (Nb) has an atomic number of forty-one. This shiny white member of the metallic elements was originally called columbium, until its current name was adopted in 1950.

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Word origin: The word vanadium comes from the Scandinavian goddess Vanadis.Discovery: Vanadium 

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Word origin: The word vanadium comes from the Scandinavian goddess Vanadis.Discovery: Vanadium 

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It was named after Ernest Rutherford, the chemist and physicist who became known as the father of nuclear physics.

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It was named after Ernest Rutherford, the chemist and physicist who became known as the father of nuclear physics.

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hafnium (symbol Hf) Silvery metallic element, one of the transition elements. Dutch physicist Dirk Coster and Hungarian chemist Georg von Hevesy discovered hafnium in 1923. 

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hafnium (symbol Hf) Silvery metallic element, one of the transition elements. Dutch physicist Dirk Coster and Hungarian chemist Georg von Hevesy discovered hafnium in 1923. 

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Klaproth was unable to isolate the metal itself. That was achieved in 1824 by the Swedish chemist Jöns Jacob Berzelius but there was little use for it or its chemical 

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Klaproth was unable to isolate the metal itself. That was achieved in 1824 by the Swedish chemist Jöns Jacob Berzelius but there was little use for it or its chemical 

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Interesting Titanium Facts: Titanium was discovered in 1791 by William Gregor, but was named by Martin Heinrich Klaproth. 

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Interesting Titanium Facts: Titanium was discovered in 1791 by William Gregor, but was named by Martin Heinrich Klaproth. 

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Scandium (Sc) has an atomic number of twenty-one. This member of the transition elements group is a silver-white that has been historically categorized

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Scandium (Sc) has an atomic number of twenty-one. This member of the transition elements group is a silver-white that has been historically categorized

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Interesting Radium Facts: Radium was discovered by Pierre and Marie Curie in 1898. They extracted the element from a sample of the mineral uraninite.

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Interesting Radium Facts: Radium was discovered by Pierre and Marie Curie in 1898. They extracted the element from a sample of the mineral uraninite.

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Barium (Ba) has an atomic number of fifty-six. It is a silvery-white metallic element and is a member of the alkaline-earth metals. 

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Barium (Ba) has an atomic number of fifty-six. It is a silvery-white metallic element and is a member of the alkaline-earth metals. 

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Chromium Facts. Chromium (Cr) is chemical element in the transition metals group with an atomic number

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Chromium Facts. Chromium (Cr) is chemical element in the transition metals group with an atomic number

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Magnesium (Mg) is an alkaline earth metal with an atomic number of twelve and twelve protons in the nucleus. Humphry Davy isolated 

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Magnesium (Mg) is an alkaline earth metal with an atomic number of twelve and twelve protons in the nucleus. Humphry Davy isolated 

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A substance made up of one kind of atom is an element. Gold is an element because it only contains gold atoms. 

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A substance made up of one kind of atom is an element. Gold is an element because it only contains gold atoms. 

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Characteristics: Francium is a heavy, unstable, radioactive metal with a maximum half-life of only 22 minutes. It has a low melting point (27 oC, 81 oF) 

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Characteristics: Francium is a heavy, unstable, radioactive metal with a maximum half-life of only 22 minutes. It has a low melting point (27 oC, 81 oF) 

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Caesium (Cs) has an atomic number of fifty-five and fifty-five protons in the nucleus. A silvery-gold, soft metal, 

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Caesium (Cs) has an atomic number of fifty-five and fifty-five protons in the nucleus. A silvery-gold, soft metal, 

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Potassium is the seventh most abundant element on Earth. It was first isolated by Sir Humphry Davy in 1807

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Potassium is the seventh most abundant element on Earth. It was first isolated by Sir Humphry Davy in 1807

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Image result for rb element factsCharacteristics: Rubidium is a soft, silvery-white metallic element. 

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Image result for rb element factsCharacteristics: Rubidium is a soft, silvery-white metallic element. 

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It is a soft metal that does not occur naturally on Earth as a free element. Interesting Sodium Facts: 

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It is a soft metal that does not occur naturally on Earth as a free element. Interesting Sodium Facts: 

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Lithium as an element. Lithium is a chemical element among the alkali metals, and is the least dense solid element.

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Lithium as an element. Lithium is a chemical element among the alkali metals, and is the least dense solid element.

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Being the first element on the periodic table, Hydrogen is the lightest of all chemical elements. 

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Being the first element on the periodic table, Hydrogen is the lightest of all chemical elements. 