It is the second rarest natural element, following astatine. Hydrogen is a chemical element with atomic number 1 which means there are 1 protons and 1 electrons in the atomic structure.The chemical symbol for Hydrogen is H. With a standard atomic weight of circa 1.008, hydrogen is the lightest element on the periodic table. A fresh francium surface would soon tarnish because of reaction with oxygen and moisture from the air. The chemical symbol for Hydrogen is H.. With a standard atomic weight of circa 1.008, hydrogen is the lightest element on the periodic table. Francium – Periodic Table – Atomic Number – Mass – Radius – Density Francium is an alkali metal, that has one valence electron. It is the second-least electronegative element, following cesium. The chemical properties of francium resemble those of caesium. Francium is the second-least electronegative element, behind only caesium, and is the second rarest naturally occurring element (after astatine). Common chemical compounds are also provided for many elements. Origin of Name: After the country France: Date and Place of Discovery: In 1839 at the Curie Institute in Paris, France : Discovered by: Marguerite Catherine Perey Fr(s) + O 2 (g) → FrO 2 (s) Reaction of francium with water. It is produced both by naturally and by artificial methods. Francium is an element with chemical symbol Fr and atomic number 87 in the periodic table. Characteristics: Francium is a heavy, unstable, radioactive metal with a … Francium is very scarce and expensive. Francium is the heaviest known member of the alkali metals series. Harmful effects: Francium is highly radioactive. Periodic Table of Elements Element Francium - Fr. Comprehensive data on the chemical element Francium is provided on this page; including scores of properties, element names in many languages, most known nuclides of Francium. It used to be known as actinium K and eka caesium and has a metallic color. Appearance and Characteristics. Hydrogen is a chemical element with atomic number 1 which means there are 1 protons and 1 electrons in the atomic structure. Properties: The melting point of francium is 27 °C, its boiling point is 677 °C, and its valence is 1. Most probably, it is assumed that about 340-550 gms of this metal francium are found in the earth’s crust. Were francium ever to be burned in air, the result is expected to be francium superoxide, FrO 2. When element 87 in the periodic table (francium) does this, the extra proton means that it becomes element 88 (radium). Francium has the symbol Fr and is under number 87 in the periodic table. Its monatomic form (H) is the most abundant chemical substance in the Universe, constituting roughly 75% of all baryonic mass. Its monatomic form (H) is the most abundant chemical substance in the Universe, constituting roughly 75% of all baryonic mass.