Spring tides occur when the sun and moon word together to form the highest high tide and the lowest low tide this type of tide occurs twice a month during the A. First Quarter/ new moon B. Full/ new moon C. First/ qurarter moon D. Full/ quarter moon PLLL HELP hurry :(

Which substances have the lowest melting points: ionic covalent, or metallic

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.

How can one make a supersaturated solution? (apex)