Cambridge Secondary (7-9). Stage 9. MCE Science. Student Book - Unit 4: The Structure of the Atom and the Periodic Table - Question 20

Table 4.1: lithium (Li): density 0.53 g/cm³, melting point 180°C, boiling point 1342°C; sodium (Na): 0.97 g/cm³, 98°C, 883°C; potassium (K): 0.89 g/cm³, 63°C, 759°C. Does the boiling point increase or decrease down the group? In pairs, discuss your answer.