Define Sodium.
Define Calcium.
Define Momentum.
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the chemical element of atomic number 11, a soft silver-white reactive metal of the alkali metal group.
the chemical element of atomic number 20, a soft grey metal.
the quantity of motion of a moving body, measured as a product of its mass and velocity.
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- Sodium is a chemical element with the symbol Na and atomic number 11. It is a soft, silvery-white, highly reactive metal. Sodium is an alkali metal, being in group 1 of the periodic table. Its only stable isotope is ²³Na. The free metal does not occur in nature, and must be prepared from compounds.
- Calcium is a chemical element with the symbol Ca and atomic number 20. As an alkaline earth metal, calcium is a reactive metal that forms a dark oxide-nitride layer when exposed to air. Its physical and chemical properties are most similar to its heavier homologues strontium and barium.
- Momentum, product of the mass of a particle and its velocity. Momentum is a vector quantity; i.e., it has both magnitude and direction. ... Conversely, the momentum of a particle is a measure of the time required for a constant force to bring it to rest.
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