Flouride is known to prevent tooth decay so it is added to the city water supply for drinking. a medium sized city is populated with 150,000 people. each person uses approximately 660.0 l of water each day. how many kg of naf must be added to the water supply each year to have the required flouride concentration of 1.0 ppm?

The atomic radius of sodium is 186 pm and of chlorine is 100 pm. the ionic radius for na+ is 102 pm and for cl– is 181 pm. in going from na to cl in period 3, why does the atomic radius decrease while the ionic radius increases? a. the inner electrons in the sodium cation shield its valence electrons more effectively than the inner electrons in the chloride anion do. b. the inner electrons shield the valence electrons more effectively in the chlorine atom than in the chloride anion. c. the outermost electrons in chloride experience a smaller effective nuclear charge than those in the sodium cation do. d. the outermost electrons in chloride experience a larger effective nuclear charge than those in the sodium cation do. e. monatomic ions are bigger than the atoms from which they are formed.

Find the mass, in grams, of 5.00*10^23 molecules of f2

Which of these is an intensive property of a substance