Question

6. After reviewing your answers to questions 2 and 4 above, would you define boiling point and melting point as a periodic table family trend (vertical groups), period trend (horizontal rows), or neither? Explain your answer.

Answer 1

Answer:

Explanation: The melting point of group 1 and 2 metals decreases down the groups, due to a decrease in charge density (as atomic radius increases and charge stays constant, as the increase in shielding from more inner electron shells is more significant than the increase in proton number) meaning that the delocalised electrons

Group 1, 2, 13 and 14 the boiling point decreases down the group due to increased electron shielding between the atoms, leading to a weaker attraction between the nucleus and electrons. For group 15, 16, 17 and 0 the boiling point increases due to strong Van Der waal forces.