Definitions
Example Sentences
"Francium (atomic number 87) is the second rarest naturally occurring element in the Earth's crust."
"The atomic number 87 signifies the number of protons present in an atom of francium."
"Francium (atomic number 87) belongs to the alkali metal group on the periodic table."
"An atom of francium (atomic number 87) contains 87 electrons."
"The atomic symbol for francium (atomic number 87) is Fr."
