The graph shown represents the relationship between the temperature and time for a substance that was heated uniformly starting at 0. The substance was in the solid phase at 0. During which time interval does the heat absorbed by the substance represent the heat of fusion of the substance?

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.

Based on its chemical properties, identify the position of each chemical family on the periodic table.

Which type of fossil does this image depict?