The forward slipping movement of the body of one of the lower lumbar vertebrae on the vertebra or sacrum below it. spondylosis A degenerative disorder that can cause the loss of normal spinal structure and function.
The formula is MgâPâ. This is a reaction between a metal and a nonmetal. The product will be the ionic compound, magnesium nitride. Step 1. Identify the atomic symbols of the cation and anion. Magnesium is Mg and phosphide is P. Step 2. Identify the charge on each ion and place it on each symbol. Mg is in Group 2, so we write MgÂ²âº. P is in Group 15, so it needs 3 electrons to complete its octet.
Of special interest to Chemistry is the mole, the base unit for expressing the quantity of matter. Although the number is not explicitly mentioned in the official definition, chemists define the mole as Avogadroâs number (approximately 6.021023) of anything.