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The official abbreviation of Calcium is Ca.
Zr is the official abbreviation of Zirconium.
The atomic number of Praseodymium is 59.
105 is the atomic number for Dubnium.
Molybdenum's name derived from "Greek word meaning 'lead' ".
Neptunium is depicted in this Periodic table
Boron's name derived from Arabic word for 'borax'.
Oxygen has the highest volumetric mass density.
The atomic number for Holmium is 67.
Gallium's name derived from "Latin name for 'France' ".
Definitions - Quiz 430 
Measurements - Quiz 19 