What is the atomic radius in picometers of an argon atom if solid argon has a density of 1.623 g/cm3 and crystallizes at low temperature in face-centered cubic unit cell

we can conclude that the melting point of table salt is above room temperature (it's actually 801 deg c). the melting point of mercury must be below room temperature (- 39 deg c).

because natural gas is colorless, odorless, and tasteless, distributors add mercaptan (a chemical that smells like sulfur) to give natural gas a distinct unpleasant odor (it smells like rotten eggs). they locate the types of rock that are likely to contain natural gas deposits.

the answer is a! (2.9 x 10^-18 j) hope i could someone. : )