What do the numbers represent?
The upper left numbers represent the atomic number for each element; the number of protons found in the nucleus. The upper right number represents the standard atomic weight(mass) of each element; total mass of protons, neutrons, and electrons in a single atom when motionless.
What do the letters represent?
The letters represent the symbol of each chemical element.
What is the difference between Na and K?
Na has an atomic number of 11, K has an atomic number of 19. Na's atomic weight is 22.990, K's atomic weight is 39.098.
Na appearance is a silvery white metallic with spectral lines of sodium. K has an appearance of a silvery gray with spectral lines of potassium. Na's electrons per shell is 2, 8, 1 while K's electrons per shell is 2, 8, 8, 1. Each of these has a different melting point is different, Na has a melting point at 370.87K (207.9F), while K has a melting point at 336.53K (146.08F). Na has an atomic radius of 186pm. K has an atomic radius of 227pm.
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