Fr is in the 1st period. Groups 1 and 2 (the active metals) lose 1 and 2 valence electrons, respectively, because of their low Ionization energies. Therefore, elements whose atoms can have the same number of valence electrons are grouped together in the periodic table of the elements.. Click here to buy a book, photographic periodic table poster, card deck, or 3D print based on the images you see here! Metals tend to lose electrons to attain Noble Gas electron configuration. A heavy element with a single valence electron, it has the highest equivalent weight of any element. 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 The number of valence electrons in an atom governs its bonding behavior. It removes an electron to get noble gas configuration. From its position in the table, it was clear that element 87 would be a reactive alkali metal, the heaviest member of the family lithium, sodium, potassium, rubidium and caesium. Name: Francium Symbol: Fr Atomic Number: 87 Atomic Mass: (223.0) amu Melting Point: 27.0 °C (300.15 K, 80.6 °F) Boiling Point: 677.0 °C (950.15 K, 1250.6 °F) Number of Protons/Electrons: 87 Number of Neutrons: 136 Classification: Alkali Metal Crystal Structure: Cubic Density @ 293 K: Unknown Color: Unknown Atomic Structure Hydrogen, in the #n=1# shell, has the simple electron configuration of #1s^1#. Fr+ does not have valence electrons.Francium has 1 electron in its outermost energy level. Francium-223 also has a shorter half-life than the longest-lived isotope of each synthetic element up to and including element 105, dubnium. ... Half the distance between the centers of 2 of the same atoms OR the distance between the nucleus and valence electrons is known as the atomic _____ ionic. Helium is #1s^2#. The most metallic elements are Cesium and Francium. Francium is an alkali metal whose chemical properties mostly resemble those of caesium. Francium, number 87, was the last of these elements to be discovered in nature. Counting down from hydrogen, which is in the #n=1# shell, francium's outermost electrons are "contained" within the #n=7# shell and the element resides in the "#s#-block." It removes an electron to get noble gas configuration. Francium has 7 shells so its protons are very shielded and thus ineffective at holding onto the electrons. Fr is in the 1st period. Fr+ does not have valence electrons.Francium has 1 electron in its outermost energy level. We can see that francium has #87# electrons. Valence electrons are those electrons that reside in the outermost shell surrounding an atomic nucleus. 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