(mÃ»r'kyÉ-rÄ) Symbol Hg. A silvery-white, dense, poisonous metallic element that is a liquid at room temperature and is used in thermometers, barometers, batteries, and pesticides. Atomic number 80; atomic weight 200.59; melting point -38.87Â°C; boiling point 356.58Â°C; specific gravity 13.546 (at 20Â°C); valence 1, 2. See Periodic Table.
Types of vertebra? Vertebrae are divided into sections: the atlas and axis account for the first cervical vertebrae, of which there are 7 in total; there are 12 thoracic vertebrae, 7 lumbar vert â¦ ebrae, 1 sacrum (5 separate vertebrae in a baby), and 1 coccyx (4 separate vertebrae in a baby).here are Five different types of Vertebrae in the Vertabral collumn (spine). 1) Cervical Vertebrae (7) 2) Thoracic Vertebrae (12) 3) Lumbar Vertebrae (5) 4) Sacral Ve â¦ rtebrae (5) 5) Coccygeal Vertebrae (3). + 33 others found this useful. Yerroh Jalloh.
Regional vertebrae. Vertebrae are defined by the regions of the vertebral column that they occur in, as in humans. Cervical vertebrae are those in the neck area. With the exception of the two sloth genera (Choloepus and Bradypus) and the manatee genus, (Trichechus), all mammals have seven cervical vertebrae.