Helium is #1s^2#. The most metallic elements are Cesium and Francium. A heavy element with a single valence electron, it has the highest equivalent weight of any element. 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 Fr+ does not have valence electrons.Francium has 1 electron in its outermost energy level. Click here to buy a book, photographic periodic table poster, card deck, or 3D print based on the images you see here! ... 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. Fr is in the 1st period. Valence electrons are of crucial importance because they lend deep insight into an element’s chemical properties: whether it is electronegative or electropositive in nature, or they indicate the bond order of a chemical compound – the number of bonds that can be formed between two atoms. 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. 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. 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+ does not have valence electrons.Francium has 1 electron in its outermost energy level. Valence electrons are those electrons that reside in the outermost shell surrounding an atomic nucleus. Francium, number 87, was the last of these elements to be discovered in nature. Metals tend to lose electrons to attain Noble Gas electron configuration. 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." We can see that francium has #87# electrons. Therefore, elements whose atoms can have the same number of valence electrons are grouped together in the periodic table of the elements.. The number of valence electrons in an atom governs its bonding behavior. Hydrogen, in the #n=1# shell, has the simple electron configuration of #1s^1#. Francium is an alkali metal whose chemical properties mostly resemble those of caesium. Francium-223 also has a shorter half-life than the longest-lived isotope of each synthetic element up to and including element 105, dubnium. It removes an electron to get noble gas configuration. 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